1. Log in using your Commissioner username and password and enter your pool.
2. Go to Commissioner Console -> Invite Instructions and select New Members.
3. There are several options, but ultimately all use the same join link that can be distributed any way you'd like (email, Facebook, etc). This link already contains the pool ID and pool password, so your potential members won't need to know those...they just click the link and will be able to create their membership in your pool.