Welcome aboard! I'm pretty computer savvy but it took me a long time to get the right balance between my old school camera and posting on this board.
That help FAQ is pretty great, but I don't see all the options shown on the screen shots for whatever reasons. My major problem is that the file size of my pictures is too big. I use the site below because it is simple and easy, rather limited in what it does but it does what I want! I have no connection with the site but part of the reason I use it is it doesn't set my virus protection sensors off!
https://www.reduceimages.com/
I can post pictures here directly from my downloads after reducing them. Then I take them out of downloads and put them in my "quilting" subfolder under pictures.