I’ve already shown how to modify a TL-WR703n to add wireless capability to the TeensyNet™.
If you’d like to save $10 AND do a LOT less configuration, I highly recommend using a TP-Link TLWR702n.
Once you get the TL-WR702n, the first thing you should do is download the latest firmware update, and install it. This adds bonjour support.
Once you’ve done that, open the User Guide to the setup as a Client, use the quick start to connect to your Wireless router, and you’re all set.