Navigate to the groups page by clicking Groups in the navigation bar.

Next, click to view your own groups by clicking on the link text for My Groups.

Once, you have successfully navigated to and chosen your group from which to approve new member requests to, click to go to the Members tab, and then click on the link text for See Waiting

From there you will be able to view anyone who has requested member to join your group.

To approve or reject any member who has requested to join, simply click to approve or reject their request that will display to the right of their profile and they will be granted membership to your group.