No it's just the router homepage password: Enter the password admin and click OK
But you don't need to go into your router's homepage unless you are wanting to change some of the routers settings.
If all you want is to connect a WiFi device then on your Device, search for available networks, find your router from the list and click on connect and enter the WiFi password that is on the label (network name is also on same label) on the back or underneath your router.
I don't know because I don't know what your normal connection on device is and I don't know what speed either connection is so I can't compare them. I suggest you do a speed test on http://www.speedtest.net/ to find out.