You can invite team users by email in the following way.
<Desktop>
1. Click “Members” in the upper right corner.
2. Click “Invite new members” on the pop-up.
3. From “Invite by email” tab, enter the email addresses of new users and invite them.
<Mobile>
1. Tap “Members” on footer.
2. Tap “+” in the upper right corner.
3. From “Invite by email” tab, enter the email addresses of new users and invite them.