How can I upload photos onto my profile?
Unfortunately you can’t. I wish you could but you can’t so I am sorry.
How can I add a photo into a forum/thread?
You will need to use photobucket for this so you’ll have to make a photobucket account. When you have made your photobucket account and have uploaded a photo go down to the links on the photobucket page where your new photo has been uploaded. Now this forum used IMG codes so click the link which is next to IMG code, go to the forum/thread, right click, paste, save. You have now uploaded your photo. You also have to do the same with your signature if you want a photo on there but please make it a decent size.
Do photos have to be a certain size to be uploaded?
No they don’t however I would prefer that you use a decent size photo and not one that will stretch the dashboard to far over.