You should be able to log in as soon as you create an account - there is no need to wait to receive the confirmation email.
To log in, click the Log in to the Linguist's Search Engine link on the LSE front page. Enter the username and password you specified when registering.
A login cookie will be saved on your computer (it does not contain your username or your password), so you should click ``Log Out'' at the top of the Query or My Collections pages when you are done if you are using a public computer.