No, you can not.
You should first ask your teammates to create a confirmed profile. You can send them the following link - https://play.fiba3x3.com/signup - and they can select any language from the upper right hand corner top menu to sign up to a FIBA 3x3 profile.
When your teammates have a confirmed profile, you, as a team captain or a team lead, can just add search for their name and add to the team. No other confirmations are needed.