From RecTrac, head to "Pass Management"

Click on the "More" drop down button below and select "Membership Bulk Change"

From there enter the "Membership Code" in the filter box under the "Pass Code" field and make sure the membership code is selected.

On the right side of the window under "Change Settings", select the "Extend Expire Date" under the "Change Option" drop down menu.

Next, enter the number of days needed in the "Number of Day" box.

Then finish by clicking "Process".