Make sure you have a permission role with set permissions; Create a role.
If you would like to invite a Vault Admin click here.
Step 1: Navigate to Invite Users next to the role you would like to invite the users for;
Step 2: Fill in the email address(es);
Step 3: Select Next;
Step 4: Determine the Q&A role per user;
Step 5: Select Next;
Step 6: You can add an optional personal invitation text for additional information;
You can also choose to Save as draft (i) or Schedule the invitations (ii);
Step 7: Select Invite now.