What does referee mean in The Computer Journal?
The editor works for the journal and recommends changes to the article for clarity and organization. He or she also makes the final judgments regarding if and when an article is published. The editor does not evaluate the work technically in the same way that referees do. The referees are peer reviewers who are deeply familiar with your field of work and will evaluate your article for its scientific merit. To have your article published, it must be approved by both the editor and the referees.

For a further explanation of how to suggest referees, see the accepted answer to this question: What is a referee in the manuscript submission process?