How to crouch:
- Go into a Sneaking mode.
- Now aim your crosshair right beneath you.
- Tap on a block or right-click if you're playing on Win10.
- Jump - to go back to normal.
How to install addons:
- Download addon straight from your device
- Find and open .mcpack or .mcworld files that you download earlier
- Click it to import into Minecraft Pocket Edition
- Open the game
- Create a new world or edit an existing world
- Scroll down to Add-ons section and select the ones you want to apply
- Make sure to enable "Experimental Gameplay"