Hey, there are no stupid questions!
I'm putting up these links for free magazines mainly for our penpals, but of course you can try and get a free subscription for yourself as well. Most (if not all) of the subscriptions are limited to the United States.
Anyway, you bring up a good point, because yes, you have to submit your pal's name and address, but you must not forget to squeeze in his/her DOC number somewhere. You can do it behind the last name, but sometimes I do it when there are two lines to add an address. I use one for the facility and add his number, the other one I use for the street address/PO Box.
Hope this helps