Click the "Share Group" option from the group drop-down.
Click on the checkbox next to the username (e.g. \\greenbike\Darryl) to share the group with a single user or next to the domain name (e.g. orangebike) to share the group with all users in domain.
Select the Permissions for the user you and click "Save".
Users or user groups can now access the remote computers that are in the shared computer group.