If you want to get your custom ringtones to show up in your ringtones list, do the following:
1. On your SD card make a folder called Media (if it's already there skip step)
2. In the media folder make a folder called audio
3. In the audio folder make a folder called ringtones
4. Put any ringtones that you want in this folder
Now when you go to select ringtones on your evo your custom ringtones should show up in the list.