colorblind

Hi! i am new to this forum...and would like some help. I have downloaded the Google checkout module from the goolge website. The file name is google-checkout-oscommerce-v1.4.5a.zip I have installed it according the instruction given in in the zip file. I have got the module installed as I can see it in the OSCOMMERCE Admin page. I have put in my merchant and id numbers all correctly. But I still don't get any google checkout button on the webpage? Is there an additional code i have to put in or something? Can someone pleases help me!