Wyzer

OK when I lay down the clay to "knapp" the container, what do I need to use to do so? I tried what I had, stones, clay, sticks, grass, stone axe & knife, all while in "shift" and I cannot "knapp" the blocks around it, I just end up destroying the item. I am running the latest release, 1.8.6 on Windows 7 x64. Thanks. OK, I figured out how to make the container, the issue is that if you EVER release the shift button for crouch, you lose the ability to do/complete any knapping to create the container. Now what I need to know is how do I access it? I tried many every key on the keyboard while having it the active block. No joy.