The first 8 measures will play twice. Make sure in your charts to always pair an open repeat bar line with a closing one.

You can also add a text indication like 3x4x...Nx in the last measure of the repeated section and it will be repeated N times. Do this using the Text editor keyboard for iOS and Android, or (Mac version text editor)
Repeat text
In conjunction with repeat bar lines, 1st, 2nd and 3rd endings are also recognized.
You can also use the standard Single and Double bar repeats: