iOS, Android

Transpose all chords in chart and change the Default key signature

For example, you have sheet music for a song in one key and want to edit that song's chords in iReal Pro which is in another key—they need to be in the same key to easily compare and amend.
 
Select the desired key signature and tap Set and Transpose.
 

Set the Default key signature only

Open the Editor (pencil icon), tap on Info (i) , then KEY, select the key & tonality (major/minor) you want and tap Set.
If you select Set, only the Default key signature of the song will be changed – without changing any of the chords.
 
See this post for troubleshooting: Key doesn't match