Try this: Make a post. Type whatever you want to say then look at the bottom of the text box you just wrote in. You'll see two options. One says, "Post Quick Reply". The other one says, "Go Advanced". Click on 'Go Advanced. This will take you to another screen and you'll see the text you just added. Now scroll down and fine the box that says, "Manage Attachments". Click on it and another page will open where you can browse your computer files to find the photo you want to post. Open that picture file and click on "Upload"
When the photo has loaded close that page then scroll down below and click on "Submit"
If there is a problem with your photo size it will not load but it will tell you the file is too big. You'll need to reduce the size to no bigger than 1024 X 768. You'll need some type of photo editing software to do that.
Try this and let me know if you have a problem.
Tom