Still a little confusing. I'm sure Ross will need some clarification on which you are having trouble with.
1. Can you log in to your site?
2. If you can, do you see the admin icon next to the user icon?
3. if you do, does it take you to the admin panel?
The Oxwall admin panel is where you go to manage your site "change themes, manage plugins, manage users, etc" The Oxwll admin panel doesn't require a separate log in, if you can log in to your site with your admin credentials.
CPanel is where you manage your hosting account. This does require a log in and password. CPanel access has to do with your hosting provider, and will have to be fixed by them.