[Rwp] inserting a a midi note using piano roll

[Adrián Mena]

Hello everybody, I hope all of you are doing great!
I’m trying to insert a specific midi note in a specific moment on a
midi track using the piano roll, but don’t know how to do it.
When I hear the recording, there is a blank space, and a  note should
have been placed there, how can I add it manually?
May be that space was created by the quantization I did, but I’m not sure.
Thank you for any help.