You can't without mods.
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Left click the mouse while holding the mushrooms.
Left click here you want it to go while holding the door.
In order for a powered rail to work, you need a redstone torch placed right next to it. This torch will power 16 rails in each direction. Keep this in mind while placing them.
You place a block by right clicking on a spot while holding the block you want to place.
the same way you do on pc... hold right click while holding the food in your hand.