If you post your question there, then it won't be "nearly 2 monthes non-posted," will it?
In any event, given that Senab's build is using the old menu system, it should start in the file browser. If you've loaded music using iTunes, your music will be hidden, but you can find it by using the Database. Enable the database, make sure that your "view files" setting is set to "Database," and you should be able to browse your music.
The Rockbox Manual will provide you with additional information.