Everyone (except guests) can invite new members to a team.
Go to the Team Settings section in the navigation bar:
Click the Invite Members button:
You'll need to designate a permission level for each invitee. See our Permissions Guide for full detail on access permissions.
If you only have Guest permissions, you'll need to reach out directly to the team Admin or Owner to upgrade your permission level. As a guest, you can see the name and emails of your team admins and owner in the Team Settings section.