The pics have to be a of standard format (sorry not sure what they all are but usuallt jpg is easiest.
These days with cameras being so flashy and 4-6-8-10-16-even24 Megapixels the tircky part is reducing the images to less than 256k filesize. Yo ucan then attach them to your post (below the part where you type, sure you've seen it). Or you can link to the picture if it's already on the net somewhere using
Good luck, just have a practice, also use the preview button to check it all works ok