When entering GitHub details its not clear what to put into the Github Account field - is this the user's account or the Joomla! account?
So the first two fields are the repository that you want to work with. By default, it's joomla then joomla-cms. The "GitHub Account" field is where you should put in your username with the password in the next field.
So the first two fields are the repository that you want to work with. By default, it's joomla then joomla-cms. The "GitHub Account" field is where you should put in your username with the password in the next field.