Many people have been confused on how to put addons, or "Behavior Packs", to Minecraft iOS. As far as I know, there are two ways to put Behavior and Texture Packs onto Minecraft. Through Safari, or through iExplorer on the PC. This tutorial will show you how to easily add Addons to Minecraft iOS and Windows 10.
Step 1: Where to Get Addons.
There aren't many places yet to get addons, and some of them may have malware. for a more trustworthy website, try "mcpedl.com". It has a number of addons, maps, textures, mods, and more. When at the website, click on the three bars at the top right (Full bar is revealed on PC), and tap on Add-ons, under the Mods section. Here, you will see a list of different addons you can find and use. I strongly recommend trying MineCars. When you click on an addon, you can see all the information of it, and what is changed.
Step 2: Installing Addons/Resource Packs (iOS)
Addons and Resource Packs are installed exactly the same way as each other, so just follow these instructions, only replace the addons with resource packs. At the bottom of the page there should be green download links, saying (.MCPack) or (.MCWorld). MCPacks are the behavior and resource packs, and the MCWorld are maps. Most addons will have 2 downloads, one for the behavior pack, one for the resource pack. Both are required. When you tap on the link, it will either take you straight to the download, or sometimes will go through adfly first. You should end up at a white page with a paper on it, saying the name of the behavior or resource pack. There should then be a blue link at the bottom saying: Open in "Minecraft PE". Tap on it, and it should open the Minecraft PE app. When it loads, a small bar should be at the top of the screen saying "Successfully Downloaded (Addon/Resource Name)" When you press play, and either create a new world, or press the pencil icon next to an existing world. When in said menu, scroll down on the left side, you should see a section named Resource Packs, and Behavior Packs. When you tap on one of the packs, a warning will appear, telling you that your world may become damaged from using them. Press ok, and tap on the pack again to add it to your world. Make sure to include the resource pack that goes with the behavior pack (If there is one), so your game looks right. You now should be good! Press play, and get to having fun!
Step 3: Installing Addons/Resource Packs (PC)
Installing Addons to Windows 10 edition is similar to iOS, but a little more tedious. Start by downloading the .MCpack you want to your computer. when you have it downloaded, rename the addon from "addon.MCpack" to "addon.zip". You will also need WinRAR to extract the file. Once the file is extracted, go to the following file:
Once there, you should see a couple of files. Take the extracted behavior pack and put it in the "behavior_packs" folder, and the resource pack into the "resource_packs" folder. Now all that's left is to open Minecraft Win10 Edition, click the pencil icon next to a world, and select the packs to the world. There you go! Now press play, and have fun!
Step 4: How to Remove Addons?
I have not found any ways to remove these addons, besides plugging your phone into a computer, and delete the files using a file viewer like iExplorer. If you know a way to delete an addon without needing a computer, please comment. Thanks!