Proper way to access to appliance through ssh?

I cant access apps from marketplace no matter what:
added publickey to

not working !

what am i missing?

post your template (edited screenshot, or the redacted source) or a (redacted) deployment file, or become root via single-user and post the context file from the ISO.
We need to look at this because it’s really supposed to just work like that.
Also, please the exact name of the marketplace appliance you last tried. So we can make sure it’s really something in your system. (I promise it really works fine here, but lets be sure)
Did you double check that you use right user to connect? Sometimes you need to connect as root.