Go to jpgbox.com I don't register but use the program as is. Under the red banner, choose file. If it is oversized it must be resized. (more on that later)
Assuming it doesn't need resizing, choose file. Be sure to open file on the pop up screen of photos.
Scroll to bottom of page and upload as guest.
When photo comes up, I select the 800x600 size, then copy the two lines of code in the below 'for forum, etc." box.
I paste it on the forum. If the file size is too big, I resize the photo at:
https://www.befunky.com/create/
Once resized, I save it under another name and use that in jpgbox.com