When you are typing a new post, make sure you are in
"FULL EDITOR AND PREVIEW MODE" (you can find it next to the SUBMIT button...click it to be in that mode)
Now you have the ability to insert a graphic or file.
HOW TO INSERT A GRAPHIC OR FILE FROM YOUR COMPUTER:
When you are typing up a new topic post or a reply to a post, look below the box where you are typing. You will see the navigation choices "Attachments Poll creation Options". Click "Attachments" and you'll see a button "Add files". Click it, and you can search your computer for files to upload into the post.
HOW TO INSERT A GRAPHIC OR FILE THAT IS ALREADY PUBLISHED ONLINE:
When you are typing up a new topic post or a reply to a post, look above the box where you are typing. You will see many symbols, one is a box with a couple triangles inside (it's supposed to look like a mountain scene with a dot for the sun). Click it and you will be able to enter the url (address) of your file or graphic that is published online.