1.Tap the install button.
2.Tap the Minecraft icon in the pop-up menu.
3.Depending on the downloaded file, the subsequent operations are slightly different.
.MCWorld, .MCPack
Some add-ons are .mcworld or .mcpack files. If it’s a .mcpack file then a notification will appear letting you know if the pack has been successfully imported to your game. If it’s a .mcworld file then Minecraft Pocket Edition will be automatically launched and a world with the add-ons automatically opened.