How to say correctly in the past "login" or "logined"? [closed]

Solution 1:

The person was logged in to the website.

log in is a phrasal verb so only the first part of the verb changes when you wish to change the tense. It follows the same rule as sit down (She sat down.) or drop out (He dropped out of school.)

See also the usage note for log in on dictionary.com.

Solution 2:

logged-in would be the perfect term for that.