Click on 'My Account Tools' at the top and select 'Transfer a non-usaa investment'. That should get you started. You will probably have to fill out a form(s) with the originating establishment too. Good luck.
All MOST-529's are state specific but can be transferred to another investment account without penalty. That being said, you can't transfer a lot. For example, here in Missouri we are limited to 1 transfer per year.
I bet there is a 'transfer' section on your current institution's website that will outline the rules and procedures. :)