In Mids, under the export/import menu, there's an option to export build to Beta server.
Just follow the directions.
When you get into Beta, under the freebies menu, MRB Beta Build Menu, click the give enhancements button part 1, and it will give you the first half of the enhancements from the build. After those are slotted, click on the second Give enhancements button for the rest of them. Slot up, and enjoy testing.
Hopefully those instructions are clear enough.