Use the Item Lister to find a list of your depository's selections or non-selections. The Item Lister is is organized by Item Number, so you will want to use the List of Classes to match publications with item numbers.
To change selections, you will need to log into DSIMS from the main FDLP page under “Collection Tools.” Your username is your depository number and the password is your FDLP password, often beginning with FDLP and followed by numbers. (If you don't have your password saved, there is a link on the page to retrieve it).
Once logged in, choose “selection profile” to make any changes that you want. DSIMS is organized by Item Number, so you will want to use the List of Classes to match publications with item numbers.