I have not been successful in figuring out how to install a banner below my translator.
see : http://herbal-weight-loss-pills.com

Am I in the right place seeking advises on how to proceed ?

Thanks

what have you tried to do?
I also suggest you upgrade to 3.5.1 (http://wordpress.bytesforall.com/?p=92)

I just upgraded to 3.5.1

So far I have looked for instructions in the options area. I also have googled for infos...
I don't have to confess being new to this...

add a text widget to the sidebar with teh code you have to add teh banner. If you don't have any banner code, (I'm assuming you are trying to place an AD) do a search on AD plugins and use one of them.