There are a couple of ways to block a number, using our CallWatch app.
You can go to the Block List view and manually enter a number by tapping on the plus icon located in the lower right corner of the screen. There will be a pop-up message that follows saying ADD to Block List.
You can go the the Activity view and tap (or long press) on the number you'd like to block. There will be a pop-up screen where you can select the Block option.