He,
I can't say which router you should use. But have you reset the thing (probably yes)? Just turn it off and on. Should fix most problems. Still problems? type your ip adres into the bar (something like 192.94.225.202). For me it's enough to type speedtouch.lan in safari.
You mean the webcam in your macbook pro? not an external? Cause it's pretty simple actually (ofcourse it isn't when you've never heard of it). Just open "photo booth". (from programs or spotlight). You can make photos, videos and with a lot funny effects.