Text input not working

Hi, i am new to Figma and while testing the free version, i am stuck with entering a test. I searched this forum, but i could not find any real help so far. I performed all the advised steps to similar issues:

I add a frame and choose the text tool, then i should be able to simply click and write or draw a text field and write. When i want to type, my keybord keys move through the menu bar on top and also to the right part where you can edit the components. But no text.

When I enter a Text via the left navigation (layers, assets), i cannot see it in the frame.

I use a macbook air 2018 with the latest OS.

Any advise?
Thanks and cheers