Even simpler.I have just discovered that it possible to simply right click on ANY image on ANY web page then select Copy on the resulting right click context menu which will store that selected image in your computer's clipboard, from where it can be equally simply be placed into your message by again right clicking in the position you wish it to appear and select Paste from the equally resultant right click menu Pste. I have just made two screenshots that I proceeded to upload to Facebook and did just that then wonder of wonders
equally simply the two screenshots can be inserted without any further to do

I had first of all experimented by using that technique on one of the photosof the HUGE aircraft that had caught Char's attention

and just to prove my point I also copied it from where it had been initially displayed and pasted a duplicate copy .voila!!!
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"Sir" John Fowles Bt
Honorary Curator Bootleg Museum
(where Sir does not signify that I am a fully benighted Knight just a Bt which signifies a humble Baronet -?? read the wiki!)
I meant no one no harm
Once inside we found a curious moonbeam
Doing dances on the floor