To enter your W-2 click the Personal tab at the top of your page when logged into your account, Continue, I'll choose what I work on, click Start or Update at Wages and Salaries.
Yes, if you have a capital loss carryover, it should be carried forward automatically until used up. Be sure it is there. I believe with the online version you will be able to check by clicking My Account at the top of page, Tools, View Tax Summary and/or Preview my 1040.
