Unable to create kvm instance from existing image

I am trying to create a new kvm instance from an img file which I created previously.
Sadly, there is nothing in the gui to choose the img file to base the new vm on.
After clicking on Create, I get the error message “Failed to create system : An initial system image must be selected”
Which makes sense, since I can’t choose the initial system image.
What am I doing wrong?

OK I found out how to do that.