Future will pair you with a few coach choices they think might match you best based on the answers you give on their short sign-up quiz.
You can go with one of their suggestions, or instead visit their trainer page where you can read through the trainer bios and choose a coach on your own.
To narrow down the choices, coaches can be filtered according to their style (motivating, high-energy, supportive, etc.), training expertise (general strength training, bodybuilding, prenatal and postnatal, limitations, weight loss, etc.), sports focus, and languages are spoken.