In order for a .jpeg or other picture file to be posted on the forum, it must be reduced in size. So the info I provided previously is one way to do this. I know there are other software applications which can do this as well.
Now one is ready to ATTACH it to a post, after the pixels have been reduced.
When a person is getting ready to place it within a post, they then scroll down to the ADDITIONAL OPTIONS section, when they are ready to add the picture file.
Click on MANAGE ATTACHMENTS. A new window will pop up.
Click on BROWSE, locate the new-and-reduced picture file, and then UPLOAD it. This will take several seconds.
That's it in a nutshell, at least the way I do it.
JAM