It's an actual job. To be a moderator you would need to get a university degree, have an area of expertise, have work experience as a moderator. Then you could apply for a job if you lived in the same city as one of their offices.
If you are interested in the Community Moderator position, you can go to the Ask.com website, and click on the "careers" link at the bottom of the page. Any time there are open moderator positions it will be listed there.