Are you serious? :O

Ok, theres a Print Screen button on your keyboard, find it, push it.

Then open an image program (Paint usualy)
Push Ctrl+V (Paste) and your screenshot will appear.

Save it, then upload it to a free image host (www.imageshack.us ) or google one.

As for a Tut, im not sure..someone else will have to help you on that bit.

~Dean