Glb, firstly congratulations and welcome to the forum!
Posting a pic is like so many things in life, complicated before you understand it and simple after you've done it a few times. Basically you need a free signup to a photo sharing site such as photobucket, then you upload your pics to the site. Lastly you copy and paste the img code of the pic you want in your post. Sounds complicated but it's not.
I think there is a thread right on this forum that shows you how and YouTube has several videos that make it easy