How to practice add9 and other chords?

[chatgpt]

Hi, I found that there is sus2 chord in the software, but there is no add9 chord. How to practice add9 chord?
Csus2: C D G
Cadd9: C D E G

[Quentin]

CDEG would be named Cadd2 in EarMaster, and CEGD, Cadd9. You can add both chords to EarMaster's chord library in order to use them in Customized Exercise mode, but unfortunately it's only available on Windows and Mac for now.