To join alonetone, normally people have to sign up and be approved by a moderator. This is due to the massive amount of spam we’d otherwise get if we had public signups (see: soundcloud).
However, this forum is private to users and you seem pretty trustworthy to me. So feel free to share this invite link that lets your friends setup an account immediately.
You can also create a second account for yourself if you like (maybe someday we’ll allow you to create “aliases”…)