Add an intro in one of two ways.

 

Play the ending as an intro. Tap and hold a measure a few bars from the end, then play from there, and add one chorus to the repeat count. (Mac, Windows: double-click the measure, or click it and press the Spacebar.)

 

Build an intro in the Editor. Tap the Insert space button to add blank space at the top of the chart, enter the intro chords, add double bar lines and a time signature, and mark the sections in and A.

 

For the full step-by-step guide with screenshots, see Add an intro to a song on the iReal Pro website.