Double click to edit a text.
It seems logical, but apparently, not for revit.
The thing is that to be able to do it, you have to firstly select the text. Then double click.
What a waste of time (so you think you are in editing mode, you push delete, aaaand, it's gone...)
And i notice that you can delete object with the backspace key, exactly like the del key. Nothing logical at all, as any other software use it like that.