Mscb1100, Posting photos requires you to do one of three things:
1. Find a way to reduce the size of your image files so you can upload them directly to the forum. I can't remember off hand, but I think the file can be no larger than 250 kb. You have to do that on your computer and you'll need a bit of software to do it. What you should use will depend on what computer and operating system you use.
2. Use a third-party photo hosting site that allows you to include a link to your photo in the post. Many of us used to use Photobucket, but the company imposed an outrageous charge for the privilege so we all moved away. Current favourites are Imgur and Postimage. They're free. If you decide to go this route, plenty of us can provide further help.
3. If you're using a mobile or tablet (and maybe Windows 10 on a PC, but I can't remember) you can use Tapatalk to access the forum. Tapaptalk acts as a third-party photo hosting site and allows you to upload photos and link them to your posts. Better than that, really, it automates the process for you. But you have to have the photos on the phone or tablet to upload them.
This old post will give you lots of information on how to use Photobucket. As Imgur and Postimage are essentially the same, you may find it helpful.