Hi Jaz,
For me I started a Photobucket account (free) then just hit upload, choose the pic you want. When this reply box is open, right above the first happy face is the Insert Image, click that (I am already logged in on Photobucket), use history, when in PB hit library, the pics will come up, place cursor over the the pic you want and click on share links. A box will open up, click on the bottom option which is copy img. Then just use the back button to the reply box, right click while the cursor is between the brackets and viola! If you have a problem you can ask

Dani
I suppose I should offer up this disclaimer: This is an old person's non-tech method