If you're the admin on your Ethnio account, you will see a team section under account >> team. Head there and choose to either share everything with everyone, or assign specific permissions to screeners and/or folders. Folders can be handy because you can easily drag and drop screeners into that folder, and know they will be shared automatically without having to mess with permissions.
Step 1: Choose Permissions Style
Most customers share all screeners with all team members, but there are lots of cases where you need to restrict access and choose permissions for each team members. Flip this toggle to "off," to edit permissions
Step 2: Click Permissions
If you want to edit individual permissions, click the permissions link after you've flipped the toggle above to "no"