LG Optimus Slider for tethering Kindle Fire
I was able to figure it out. :)

after getting my phone rooted, I found this link:

http://code.google.com/p/android-wifi-tether/downloads/detail?name=wifi_tether_v3_1-pre113.apk&amp;can=2&amp;q=label%3AExperimental

All you have to do is download that code in the link into your phone. It takes you to an app, and you install it. This is an experimental (beta) version of the app, which uses infrastructure wifi -the updated version uses ad hoc.

The beta version works great, and now I can get a great signal on my kindle fire from my phone, without having to root my kindle.