The start and end of simple repeats can be defined by setting appropriate bar lines. For instructions on first and second ending measures see volta.

Playback

To hear repeats during playback make sure the "Play Repeats" button on the toolbar is selected. Likewise you can turn off repeats during playback by deselecting the button.

In the last measure of a repeat you can set the property "Repeat Count" to define the number of played repeats.

Repeat Symbols and Text

Text and symbols related to repeats are located in the Repeats palette:

To add an object from the Repeats palette, drag it onto (not above) the measure where you want it to occur. The object then appears above that measure in your score.