if you mean 'ask ecrater support', the link is in bottom right corner of pages. where it says contact us. http://www.ecrater.com/contact.php
if you mean ask seller a question, links in same spot. when you are viewing a seller's store or listing, just click the contact us link and it will show you seller's contact info, rather than ask ecrater a question page, since youre looking at seller's pages.