Admin login in (in all external services signup)

I’m looking to make a separate page as portal for admin without signup option,- so that no1 decides to avoid external services- without router (any chance that I could just specify some url adress without having to install router for non CLI to login), also that user account needs to be created manually in collections using accounts-password package (so that some1 just copies repo and logs in as admin). I’m using allaning:meteor-roles if that may help.

PS more specifically I don’t know if creating a user collection will just do that rather than tapping into accounts-password package.