Gday Trinno
If you have the image saved on your PC, make sure it isnt too big. (600 x 600 pixels seems to work good). Click on the "manage attachments" button when you post reply or start a new thread. Attach your pics and upload them.
If the pics are from another site, select the "insert URL" and insert the web address of the pic you want to link to. To get this right click the pic and copy the link location
Alternatively, go to this thread that b2tf has put together
http://www.fordforums.com.au/showthread.php?t=20569
Need any more help, sing out