Changes

Once you have found a tile of clay, open your inventory (F3), double-click a shovel to activate it, and then right click the clay tile. You should see a new menu option named Dig; click it. If you've started to dig, you're on the right path, but if it states that you're on too steep a slope to dig, simply move to another position and retry. Slopes become too steep when the dirt slope is greater than 3x your digging skill (This includes any slopes on any tiles bordering the tile you wish to dig on).