The phrase "separate login" means having a unique way to access something, such as an account or a website, with a different set of credentials or username and password. Full definition
Separate account will be provided to every user through separate login system which help them to see their previous booking and new offers. (travelpd.com)
If you are already a member of the Delta SkyMiles program, you do not need to create separate login information for the online shopping portal. (upgradedpoints.com)
You may only create separate logins for other people if your plan allows. (brandredresume.com)