Hi Lizabeth,
It's super simple to get rid of the string of random numbers so the url is easy and easier to direct others too. I'm sure you're referring to a url on Facebook that looks something like this
https://www.facebook.com/LondonandGrangerHere are the steps:
1. Go to the page you manage, click on "edit page" located at the middle upper part of the page.
2. Then choose update "page info"
3. You should then see "Page Address" (this should be the second from the top) click "edit"
4. From here you'll be able to choose the page address you want, which once you do so you'll get rid of those random numbers in your URL.
And you'll have a nice clean URL!
Best of Luck!
~Felie