Upgrading RAM in Inspiron 1720

May seem like a foolisg question to many....

many Inspiron cam with 2x 1gig of Ram (2 gig in total)

so me being me i figured " Ill buy 2 x 2gig of ram and upgrade to 4 in total.

When I open the back i only find 1 memory slot so i can only use 1 ram to upgrade to 3. Is there any way i can install my second ram in?

Thanks in advance,

Adam