When you click into one of the databases from the A-Z list, you will be asked to enter your barcode and last name. If your barcode isn't active, you can try your student ID number instead in this format: qcc12345. By now you may have already found the way in.
If you have any trouble, there is another link (and also a tab called Remote Access) for access to the resources for all Mass. residents, which should let you in without having to log in. Hope this helps. Dale