Starting from scratch..
When posting directly below another post in some sections there is no img tag above..
Soo.
Copy the words you may have typed.
Above to the left is a "post reply" button hit that.
Paste anything copied you may have.
Then
(hang on just going to the "post reply" button).
(just pasted this so far, over.)
Now above is a icon with a tree.. the add pic button. Clk that.
A new page opens.
Minimise that and drag from your desktop or whatever folder the pic you want into the "drag your files here" section.
A upload bar appears and wait for it to finish.
The pic now appears in the column below.
Clk on it and it will now appear in the "preview " part
IF you have changed the size of the pop up window with "preveiw" it will now most likely not show the bottom border, or may not show the bar on the rigfht side to see the bottom of the window.
Drag the window bigger so can see the bottom right hand cnr and can see the "ok" and "cancel" buttons there.
hit "ok"
Pic comes up in your reply ready to post.
A suggestion.
Before uploading crop your pic so cut out background edges anf bring what you want to show to the front....which I have not done in this upload.