Hi Shana-
1. Get on the internet, type in "Xing Encoder" on any search engine
2. Find one that's free
3. Download it
4. Install it on your computer
Then it will wlak you through how to use it for the most part.
Xing is a great mp3 encoder, and I found a few sites where you can get a free version.
Any more help you might need, let us know, we're here to help!