If you want to add an award to a volunteer, you can set them up under the Awards Tab.

button.
The Volunteer Award Detail Window opens.

For a "Recognition For Hours Contributed" type the volunteer must have records of working that number of hours. For a "Milestone" type hours are not required.

Alter the date as needed.

button to add the Volunteer's hours to the Awards.
From the selection flyout, you have the option to add All activities or All un-recognized activities.
button.
button in the Awards Toolbar / ribbon bar and close the Awards window.

The new awards will be displayed under the tab.
