Definitely put a 1-2-3 type basic explanation of how a user would use the service on the front page, possibly below the fold. I can't see how the service works

Definitely put a 1-2-3 type basic explanation of how a user would use the service on the front page, possibly below the fold. I can't see how the service works and don't want to register before having some basic understanding of what it does beyond a vague, one-sentence description.