To insert pictures in your Forum posting -
Click on the picture symbol in the edit tools bar - this symbol is the 8th from the far right or the 12th symbol to the right of the word "Source" in the top tool bar.
That open up an Image Properties dialog box
Click on Browse Server
That opens up a File Browser window
Click on Upload at the top left in the File Browser window, then select the picture file on your computer that you want to insert.
After the picture file is uploaded, click Insert File. That will put the picture into your posting.
This returns you to the Image Properties dialog box where you need to do 2 more things:
Under Image Alignment, select Left
Under Image Size, select Danland Breakpoint group.
At this point you are finished inserting a picture into the posting.