Here are ways to invite others to a shared folder/label:

Add more members to a shared folder:
Note: Member has not been invited in this case.

1. Go to the Share tab.
2. Click the dropdown of the shared folder to see members who have access:
   
3. Click “Add more people” to invite other members to access the shared folder:
   

Reinvite a member to a shared folder
Note: Member has already been invited in this case.

1. Go to the Share tab.
2. Click the dropdown of the shared folder to see members who have not accepted the share:
   
3. Click “Reinvite” to reinvite the member to a shared folder:
   

Invite members via some other means (Skype, email, etc)

1. Go to the Share tab.
2. Click the dropdown of the shared folder to see members who have not accepted the share:
   
3. Click “Copy Link” to copy invite link to a shared folder:
   
4. Then share this link to others via Skype, email, etc