Adding memory turns to be a hard job....

The other day i just bought a new all in one pc from tigerdirect.com
HP 100B all-in-one pc and it comes with windows 7 and like 2GB of ram.... Well on the specifications tab i see that it can be upgraded to 8GB of ram so i ordered the pc and 2 4gb cards to put into the pc well turns out i cant get into it so easy does anyone know a way i can get into the all-in-one pc? I watched some videos and some all-in-one pcs say that theres just covers to remove that slide off so you can get to the hard drive and to the ram but mine is the whole back so i would need to take the back off away from the screen some how... let me know what you think!

Thank You!