If the account is still in the Registration Queue, you can select the radio button "Re-send Verification" and then click the Submit button.
Of course, you can still manually approve the account. I have to admit that I have never tested that feature and thus cannot say what the result would be, but I am thinking it would set the account as active just as if the link in the verification e-mail were clicked.
I often get folks that create an account and then never verify it. I don't worry about it. It happens.
