If you have users who are not frequent users, you can protect the account better by terminating their access. This screenshot shows several users with different access levels, and some users who haven’t accessed the account in many months. Rather than leave your account open to possible abuse, you “minimise the attack surface” by reducing the number of users with access permission.
Click on the “Terminate access” to remove users from the access list.
Remove Infrequent Users From Account Access
Folks,
I just received an email from Google ‘Help’ (AdWordsPro Sarah) referring me to this article. This doesn’t solve my problem.
I was previously invited by a client to view her adwords account. Now I’m on the account and I can’t get off. When I login, none of those choices (in your example) in the right-hand column appear (i.e. where you have the big red circle). i.e. ‘Change Access/Terminate Access’ is not an option.
I have a Gmail account and I use GoogleReader and calendar. I don’t want to lose my regular acccount but I DO want to get off this other account so I can sign up for adwords for myself. I’d be super, super, super grateful if someone can help me with this. Thank you TONS.
I’ve been wondering about how to solve your problem… The first and easiest step is to ask anyone in the list with “Administrative Access”, to remove you. If they don’t… Pester them for a bit.
Failing that, I have a much more complex answer involving Google Apps. It’s a really nice answer, if you plan on managing lots of client accounts.
I’ll try to write it up. I haven’t seen this described anywhere else. 
i want to terminate or cancel my account as of righ now.thanks
Hi Armando – You can terminate your own account. Pause any adverts, and then under the “My Account” tab you can cancel.