For PC/Windows - right-click on the image you want to save or use here in forums. To save to your computer, choose "Save Image As" from the dropdown menu that appears. Then just save it to wherever you want on your HDD.
If you want to re-post here, Choose "Copy Image Location" and then paste it into/in-between the [img|[/img] command that appears when you click the IMG link on top of text box when entering your post.
Posting in your profile or gallery you can upload the image from your computer. But to use it in a forum post, it has to have a URL, or web address. Hence the two different instructions.
Here is the original post Jessy referred to:https://www.50plus-club.com/forum/viewtopic.php?f=227&t=58454&p=2433723&hilit=snag#p2433723