Login (log-in) is a noun. It is the name you enter to be able to use a computer. It is never a verb.
Log in is a verb. It is when you enter your password to be able to use a computer.
- Please enter your login.
- If you are already have an account, please log in.
More examples following the same rules:
- cleanup
- shutdown
- shutoff
- startup
- workaround
