make a cookie for me, please?

Question

I NEED to log in to deviantart.com and collect from there some images I like, for personal use. I am an artist!
I use a windows application (NOT an ASP). I must use cookies to login to that website and set a "mature content" , to be able to see all artists posts.
I need a code solution, or an idea about how to make it.
I am struggle with this for half of a year already and I couldn't resolve it by myself.
Please, and thank you.