In the URL bar at the top of your browser you'll see something like:
http://www.theanswerbank/blahblahblablah
This is the "address" for the page you're on.
So, if you want to reference another page in this way, you can:
1. Visit that page
2. Click into the URL bar
3. Press Ctrl+A to select all the text in the box
4. Press Ctrl+C to copy it
5. Go to where you want to place the reference, write you answer etc and then press ctrl+V to paste it
Try it in notepad a few times, it'll be second nature soon enough!
Spare Ed