Hello Danish:
When you go to your site builder pick the page where
you want to put your banner then click text. Type or copy your
code then highlight it and copy it. Go up to the tool bar and
click on the link icon. A window will open and prompt you
for your code, copy it  and fill out the rest of the info. I have
three banners on my sites link page so I know you can do it.
check it out a http://www.hilsideweb.ws I hope this help you.
Jim