It's cool. We were all new at it once. Here's what I do:
I take pictures on the digital camera as usual. I then upload the pictures into Photobucket, setting the image size at 640 x 480, although other sizes are available. You'll see the option in the "Upload Images and Video" box.
From there, I copy/paste the IMG code for the image (its the last of the four offered when you put the cursor on the picture) into my posts.
Just that easy.
There may be some advice in the Community Assistance (aka Forum Help) section of these boards.
(Actually, I just looked, its the first topic... )
Hope that helps - CJ