WPA2 is a relatively old wireless protection protocol, that encrypts data so that it makes it difficult decode data you are sending / receiving wirelessly.
As for FoxFi, I don't use it so I don't know how to set it up. I use PDAnet which has:
1. USB tether mode
2. Bluetooth DUN mode
3. WiFi hotspot mode
The only limitation with the free version is that you cannot go to secured websites (HTTPS). That means while you can go to sites like Amazon & Newegg to add things to your shopping cart, you will not be able to purchase those items because when you checkout you go to their secured website.