How do you say I have logged in?

How do you say I am logged in?

I login: Login is a present tense verb, so "I login" is saying "I login (right now)". I am logged in: Saying that you have logged in already and you are stating that. I had been logged in: Past tense. Saying that you were logged in, but the sentence is presuming you are no longer logged in.

Is I have logged in correct?

No, both are wrong. "She is/has logged in/on to the system." "She has logged in": "Logged in" is the past participle of the verb "to log in"; the sentence describes a completed action.

Which is correct logged in or log in?

Log in is a verb, while login is a noun. You say you need to log in and the login was not successful. To answer to your question, the correct phrases are logged-in and to log in.

What does it mean logged in?

When someone logs in or logs on, or logs into a computer system, they start using the system, usually by typing their name or identity code and a password.