cannot press "Edit" button in mixer

Hi everyone, I am still new to this and working on my tape studio slowly but almost done. I tried Ardour agian to lay some bass tracks for a demo and cant figure out to edit in input. Can anyone help? or is it a bug?

You need to be more precise on what exactly it is you want to do. IIRC there is no Edit button in the mixer.

And please take a look at the Editing Sessions section of the manual :