it's easy. Click on the square that has a tree in it(insert image icon) in the row above the reply box.
A pop up window opens up.
Click on computer and a browser window shows.
Click on browse and find your pic on your computer.
click on open in your computer window.
It will add the pic here in the box. click on post reply and you should see your post with picture appear in teh thread.
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You can also use the go advanced if you'd rather. It isn't hard either.
Click on the go advanced button below this window.
Scan down til you see Manage Attachments
Click on the Manage Attachments button
You will see a browse window
Click on browse
find your pic on your computer
Click on the pic and then on open in your window
then you will be back to browse
Click on upload(under browse )
This takes a few seconds.
Repeat browse and add more pics til you are done
Click on the Close Window button at the top of that Window.
Then continue to post your reply