Questions re Visible's Referral Program

My last experience with Visible wasn't great, but I'm thinking of giving them a second chance. The $5/month with referral sounds like a neat way to try them out.

So will I pay $5 when I sign up, or do I pay full-price at sign-up? (Meaning, is it $5 for the first month or for the second month?) Anything to watch out for?

Thank you for any info!

$5 when you sign up to cover the 1st month