Repeats set how many times the player runs through the form of the song. They are not the repeat barlines written inside the chart.

 

Tap or click the + and − buttons, or the up and down arrows on Mac and Windows. From a keyboard, the square bracket keys [ and ] step the count down and up, on Chromebooks as well.

 

You can also drag up or down on the number itself, which is Fast mode.

 

For the full guide, see Play a song on the iReal Pro website.