You use redstone things like levers/buttons/pressure plates.
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It has to be powered by a redstone signal ether next to or below the piston
The only thing you can craft with slimeballs in minecraft is a sticky piston. You can put a slimeball and the piston in the crafting to make it.
In all editions of Minecraft, pistons can push blocks, however, sticky pistons are able to push blocks too, but pull them back as well.
In survival you use a piston but in creative you just break it.
You craft a piston with 3 wood on the top row, cobble stone-iron ingot-cobble stone in the middle row, then cobble stone-redstone-cobble stone on the bottom row. Lastly, you put a slime ball above the piston in the crafting table, and voilà! You have your sticky piston!