Galapagos store page

Hello everyone!  I am fairly new to Squarespace.... been on for just over 2 weeks now and have almost finished setting up my site!  One significant glitch I have come across is that I cannot figure out how to add a second page to the "Shop" ecommerce portion of the site.  Is this possible?  Thanks.

BTW... my website is http://www.agirlsbestfriends.com

Thanks for any and all assistance