If you know your old Secondary Pin (2 Step Authentication), you can do this yourself. If you don't please follow the instructions in the tutorial here to reset it.
STEP 1: Log into your Hashing Ad Space account and go to your Dashboard. On the left menu find the tab labeled Profile, then the sub-tab labeled Change Password.
STEP 2: Scroll down pass the Change Your Primary Password form and find the form titled Change Your Secondary Pin Below. In the first box enter your current Pin.
In the second box enter the new Pin you have chosen, to confirm your new Pin enter it again in the third box.
STEP 3: Once you have entered your current Pin and chosen and entered a new Pin, and confirmed this is the Pin you want to use, click the button labeled Save Changes.
The page will then refresh and you will receive a message titled Secondary Password Changed Successfully. Thanks.