You may also simply add another router (preferably c1700) to your topology and configure it to act like a PC.
Just add a router and enter the following commands: no ip routing !Turns off IP routing function interface fa0/0 !Switches to FastEthernet interface ip address address subnet_mask !Assigns IP address to Interface no shutdown !Turns interface on exit !Returns to global configuration mode ip default-gateway gateway_address !Config default gateway ip http server !Optional – starts http server process
I like to change the ICON to look like a PC as well. You can right click the router and select: Change Symbol.
You might also want to check this out: http://www.gns3.net/documentation/gns3/adding-hosts-to-your-topologies/