How to invite friends to my private server

Minecraft
1

I already created my own server with Tynker. How can my friends join my server (but they are not Tynker’s members.)

2
  1. Whitelist your friends - on this page.
  2. Ask them to join mc.tynker.com and once in the lobby, they can enter “/join your_server” where your_server is the name of your server.