In a recent video, Michael Basham (TFI member), explains how a person can join The Family International (TFI). I have also provided links below the video which relate to applying for a TFI membership online. Included in the below links are; documentation and studies which are prerequisite reading for joining TFI.
You can read the membership documents and learning materials at the below link.
To begin the process of applying for a TFI membership you can click the below link.