Create a folder in ur file browser named forum inside it, create another folder named icon and upload this image links to it via Remote Server Url
After uploading, dn't rename it, then go to ur forum page and paste this code on your forum page footer Note:
NOTE:Edit my forum name to urs and also ur forum Admin's name, make sure the + signs are present in the script above, wrong editing may affect ur forum page, so edit wisely.