Post your photos to a free photo hosting site like imageshack or photobucket. Once you get them online, paste them into a thread using the {IMG} {/IMG} tags (substitute {} with []).

It would look something like this:

{IMG} http://thelocationofyourimagehere.extension {/IMG}

To find the location of your image once you upload it, right click the image in a webbrowser and then select "properties." Then simply paste the "address (URL)" entry between image tags.