Cant log in to gmail ?Why cant i Log into gmail account ?

There can be several reasons why you are not able to login to your Gmail account. To troubleshoot the same, you can try the instructions mentioned on the link below:
https://support.google.com/mail/troubleshooter/2943007?hl=en

GuruAid.com

Point your web browser at http://www.gmail.com

If another account comes up, sign out of it by clicking the avatar in the upper-right then clicking "Sign out."

If you then still can't sign in to your account, click the "Need help?" link on the sign-in page.

If you're getting an error message, what does it say?

Point your web browser at http://www.facebook.com

If another account comes up, log out of it by clicking the little gear icon in the upper-right then clicking "Log Out."

If you then still can't log in to your account, click the "Forgot your password?" link located just below the password box on the login page.

Log out of his account by clicking the avatar in the upper-right then clicking "Sign out."

Cant log in to my gmail account cause i forgot my password

Point your web browser at http://www.gmail.com

If another account comes up, sign out of it by clicking the avatar in the upper-right then clicking "Sign out."

If you then still can't sign in to your account, click the "Can't access your account?" link on the sign-in page.

Point your web browser at http://www.gmail.com

If another account comes up, sign out by clicking the avatar in the upper-right then clicking "Sign out."

If you still can't get in, click the "Can't access your account?" link on the sign-in page.

Point your web browser at http://www.gmail.com

If another account comes up, sign out of it by clicking the avatar in the upper-right then clicking "Sign out."

If you still can't get in, click the "Can't access your account?" link on the sign-in page.

simple either you can log out his account and use your's or you can use other web browser for this account

hey friend!
you didnt write to which web site you are trying to log out.

but i remind you log out, is to close your account, so after closing your account you cant get any friend request or cant chat with your friends!

well, i think you are trying these in some social connecting account like facebook or orkut.
first sign in to your account, then you can see friend request on top most look of your account.
in facebook chat option appears in lower right corner of your computer screen, in orkut you need to have a Gmail account to enable chat option.

regards!