All sorted now:
Thank you all for your help.
Thank you! I know it should be not a problem but what I am missing here is the exact syntax. I 've tried to follow the: https://docs.nodebb.org/en/latest/installing/cloud.html but most of them are out of date.
(I see the update for Koding now, yours? :))
I develop on chromebook most of the time so I went through all the cloud APIs. And Codio is a winner for me!
Thanks for taking the time to do the Koding. I will have a look at it when I'll have a minute.