I am sure there are more than one way. For me, once you type your message, select Go Advanced in the gray area below the message box, select the paperclip, and it will insert another screen on the top left of your computer that will allow you to access the picture you want from your computer, then download it and wait until the site tells you that it has been downloaded (and reduced in memory size), then drag it over to your message and put it where you want it to be.
Sheree & Michael NCNG LTC(ret) with Munpi and Sheba (cat).
2016 Vegas 24.1 E350 5 speed "Ms. Enterprise", Bug-Guard Screen, Recliners, Infotainment Center, HUD, ARC Shower Rod, Safe-T-Plus, Curt SpareTire Mount,Tornado Black Tank Rinser, ext. WiFi Antenna, Roadmaster Tow Sys& Invisibrake.