OK no problem - It appears that the default password XXXXX changed. We are going to reset the router and recreate the network with a password XXXXX your choosing.
While it is powered on, press the reset hole on the back of your router with a paper clip and hold it down for 30 seconds. Make sure it 'clicks' in when you press it, you'll hear or feel it even though the hole is very tiny. While still holding down the reset button, sharply unplug the router from power, and wait 30 seconds. Finally, plug the router back into power (all while still holding the reset button), and wait another 30 seconds.
Essentially during the whole process you're not letting go of the reset hole, it can be a little tricky so please take your time and let me know once you've done that and we'll continue with the next steps.
After the reset:
From this connected computer click one of the links below: LINK1 LINK2
A login prompt should pop up, to login, type admin
for both the username and password. If that doesn't let you in, try leaving the username name blank, and use admin for the password.
Click the Wireless tab > Basic Wireless Settings > Look for the (SSID) box and type a name for your network (choose manual if you don't see it), then save or apply your settings at the bottom
Click Wireless Security again > Pick WPA or WPA2 for the security mode > In the passphrase or shared key box make a password, at least 10 characters
Save or apply your settings. Wait 2 minutes then try to connect.