For shrinking the file size of photos, the easiest way is on Windows "Paint" if you are using a Windows Pc. You just open the picture in paint, click on resize, select "pixels" rather than percentage and type 700 in the top box - the photo should visibly reduce in size, then "Save as" so you keep your original and this one is the resized one. Then on the forum page, click on "edit" under your post, select "advanced options" and scroll down to "Manage Attachments" and click on that. When the attachment window opens, "remove" the photos you have linked. Then click to add the new resized ones and upload them. Close the window and go back to your post. You will need to delete the picture links that are in the body of your post.
Then go to the paperclip at the top of your post and select it and the two new links will be there - select all and they will install in the post and show up as photos when you click submit.
If you don't have Windows paint there are other apps that can resize or you could message a moderator and ask them to do it for you
