How do I add axes in Glyphs 3?

I want to add axes in Glyphs 3 but the only thing under Font Info/Masters in Glyphs 3 is “Axes Coordinates” and no ability to add axes. I am pretty new to Glyphs and since this doesn’t look like the manual, I don’t know how to create axes.

Can someone help? Thanks so much!

The axes are defined in the font settings.

Oh Georg, thank you so much! I should have looked around a little longer!!