The repeat sign % means repeat the previous measure here.
The % sign is intentionally off-set so when entered on the second space of a 4-space measure, it will appear centered in that measure.
The repeat brackets [: :] mean repeat the contents of this measure/phrase/section again once. Add x(number) using text if you want more than one repeat.

There are helpful links here:
Templates, Set-up and glossary
http://www.irealb.com/forums/showthr...1746#post21746