You need to know or have a chart of the chords of the song which you will enter in iReal Pro using the Editor.

You cannot import music XML, PDF or MIDI files to create a chart.

 

These links might be helpful to get you started:  

Templates, Set-up and glossary and coda: 
https://forums.irealpro.com/threads/lady-sunday-lazy-sunday-stefano-polo.8794/#post-21746  

For beginners: 
https://forums.irealpro.com/threads/new-users-start-here.13466/  
 
Conventions: 
https://forums.irealpro.com/threads/ireal-pro-layout-conventions.194/#post-301  
 
Glossary:
https://forums.irealpro.com/threads/glossary-ireal-pro.188/#post-282  

 

Editing buttons iOS, Android

 

Editing buttons Windows, Mac