[velma]

When you are typing your thread post or are adding a post (in the Go Advanced box) there is a paperclip icon above where you're typing, click that and it will give you upload options, including the size of file you can use. Alternatively, you can use a service such as Photobucket to upload your photos too that you then copy an IMG link for and paste that on your post, which will add the photo to your post. Just be aware that if you use that option that you may need to resize your photos before you pat them (Photobucket, for example, will let you edit photos on their site). If the photos are too large then it stretches the thread out very wide and it makes it hard to read.
Have fun!