Follow this guide if you have first reviewed Restrict SharePoint folders from certain Users and you have more than one group of users that you would like to hide folders from.
Navigate to s.uconn.edu/sharepoint and click on your SharePoint site.
Click the Settings gear icon in the upper right. It may take a moment for this icon to load.
Click Site Permissions.
Click Advanced permissions settings.
Click on the group in which you would like to add users.
Click New > Add Users in the top ribbon.
Enter the name(s) of the user(s) you want to add.
If you do not wish to send an email notification, click SHOW OPTIONS and uncheck Send an email invitation.
Click Share.