Inviting people to your project is a bit different than inviting individual observations. Inviting people will
- Send them an email inviting them to join your project
- Show an invitation on their dashboard
- Enable them to join your project if it's been set to invite-only
Only project curators can invite people to join a project. You should be able to search for people by their iNat username or their complete email address, assuming we have that on file.