thats o.k., as long as you ask, like they say "There is no such thing as a "Stupid" question".
There are 2 ways of posting pics
1:You post them directly from your pic folder by simply pressing the "Browse" Button thats right next to "Attach" and right above "Post". There should be 2, but if the edit button is enabled, you can post up to 4.
2:You post them by link. You do this by using a image hosting server(ImageShack, Photobucket, ETC), you follow their instructions (Basicly loading a pic), and you copy the link the server gives you (I think they teach you how) and copy and paste the code in "Message"(Where everyone types to leave a post). You can post as many pics as you want with this process but its more complex.
I would also like to mention that posting 10 pics in 3 posts is NOT cool and posting +20 pics or "Page Widners" is also NOT welcome here, if you do it by accident, its O.K., its your first time.
Good Luck!