guide: improve web section documentation

pages/web/prax.mdx

@@ -1 +1,65 @@
-# Prax wallet
+# Prax Wallet
+
+This section describes how to use the Prax Wallet web extension, an official GUI client for Penumbra.
+
+Currently, the web extension only supports a subset of functionality of the
+command-line client, [`pcli`](./pcli.md).
+
+## Installing the extension
+
+The Penumbra Wallet web extension only supports the Google Chrome browser.
+You must run Chrome in order to follow the instructions below.
+
+Visit the Web Store page to download the [Prax Wallet](https://chromewebstore.google.com/detail/prax-wallet/lkpmkhpnhknhmibgnmmhdhgdilepfghe), and click **Add to Chrome** to install it.
+
+## Generating a wallet
+
+When you first open the extension, you'll be offered to import a pre-existing wallet. If you don't already have one, choose **Create a new wallet**.
+During the guided tutorial, you'll need to set a passphrase to protect your wallet. The passphrase
+is *not* the same as the recovery phrase. The passphrase is used to restrict access to the web wallet
+on your computer. The recovery phrase can be used to import your wallet on a fresh installation, or
+on a different machine. Make sure to store both the passphrase and the recovery phrase
+securely, for example in a password manager.
+
+Re-enter portions of the recovery phrase when prompted, to confirm that you've saved it properly.
+Then you'll be taken to a screen that shows an initial synchronization process with the selected network:
+
+<!--
+Do we want to maintain screenshots inside the web extension docs?
+The image files will become out of data quickly, requiring maintenance, and bloat the repo.
+-->
+
+<picture>
+  <source srcset="images/web-extension-sync-progress.png" media="(prefers-color-scheme: dark)" />
+  <img src="images/web-extension-sync-progress.png" />
+</picture>
+
+## Select your preferred RPC endpoint
+
+Once you import or generate a wallet, you will be prompted to select an RPC endpoint, which is the URL the extension uses to sync with the network. 
+These are hosted by the community (including yourself, if you like), and those provided in the UI are typically offered by known validators.
+You may also provide your own custom endpoint, whether that is a community provider not provided as a default option, or hosted on a node you run yourself.
+
+## Select your preferred frontend app
+
+The extension will prompt you to select a frontend app to use with the wallet. This is a web interface that you will use to interact with the blockchain.
+The provided options are community hosted frontends, and you may also provide your own custom frontend URL.
+Connecting a frontend to your wallet grants the frontend provider a full viewing key for your wallet in order to decrypt and display relevant information, such as your wallet balance. 
+*This means that the front-end provider has read access (only) to your wallet and all of its activity.* This is necessary for the encrypted data on-chain to be parsed and rendered in a human-readable format.
+However, this means that you should only connect to frontend providers that you trust, because they can see any actions taken by the connected wallet by using the full viewing key.
+If you desire greater privacy, you can always run your own frontend, or utilize the command-line client, `pcli`, to interact with the blockchain directly.
+
+## Updating to a new version of the extension
+
+The extension should be automatically updated every time a new version is released.
+You can view the latest version of the extension on the [Prax Wallet] page at the
+Chrome Web Store. To force a check for updates:
+
+1. Click the three-dot icon in the top right corner of the browser.
+2. From the drop-down menu, choose **Extensions -> Manage Extensions**.
+3. Select **Update** on the top panel.
+
+After updating the extension manually, it may be helpful to clear the local cache,
+as described above.
+
+[Prax Wallet]: https://chromewebstore.google.com/detail/prax-wallet/lkpmkhpnhknhmibgnmmhdhgdilepfghe

pages/web/send.mdx

@@ -1 +1,12 @@
 # Sending Funds
+
+
+## Creating transactions
+
+Once you have the web wallet configured, you can use it to send transactions.
+
+Navigate to the dApp website:
+[https://app.testnet.penumbra.zone/](https://app.testnet.penumbra.zone/) and
+click **Connect**, then authorize the extension to work with the site. After
+doing so, you'll see buttons for actions such as **Receive**, **Send**, and
+**Exchange**.