Step 1: Go to the TMS URL: 

Step 2: Choose the correct account

Step 3: Click on the Extension Manager Menu Item.

Step 4: Click on the Extension sub-menu item.

Step 5: Select the correct extension.

Step 6: Click on the Details tab at the top.

Step 7: Scroll down to the “Pin to Dial” box and add a pin or remove the pin.   

Step 8: Click on “Apply” to save the changes.