Perfect - let's reset the router and set it up with a new password. This will also remove the password XXXXX is currently set on the router so you can log in.
Press and hold the reset button on the back of the router for 15 seconds, then release. Restart the computer that is connected to it via ethernet cable.
After the restart, log into the router by opening your browswer and entering this address: http://192.168.1.1/
You may be asked to change the name and password.
Once logged in, click Wireless Settings at the top of the page. Enter a new network name into the SSID box - this will be your new network name. Use something you have not used in the past, then save the settings.
Click Advanced Wireless Settings on the left side of the screen, then change the Level 1 option to WPA. In the Pre-Shared key box, enter a password XXXXX at least 8 characters, then save the settings.
The router is ready - connect your iPad to the new network name you made, then enter the password XXXXX prompted to connect. Any other wireless devices you have will need to connect to the new network as well.