Upgrading Dell Inspiron 15r

I would like to know if I can upgrade the memory in this laptop? If so, how much memory can I put in it? What kind of memory would I need to purchase?

Thank you in advance

http://m.samsclub.com/ip/dell-inspiron-15r-156-laptop-computer-intel-core-i7-4500u-8gb-memory-1tb-hard-drive/prod11550213