Hi, @m4em4e –
I’ve always found annotating to be tricky! You might check out this Zoom Support article on annotations, Even that article doesn’t do a great job talking about text annotations.
Basically, you have to click the T text tool, drag across the area of the screen or click where you want to start typing, and you should be able to type while the text “bounding box” is showing.
If you’re doing all of that but still can’t type in any text, give me more information: what device, Meeting or Webinar, screen shot (without private info please), Zoom version. Maybe with more details I can figure out what’s the issue.