Step 1
Click “Download” in the addon/map/building/texture/seed detail screen
Step 2
After finishing download, Click “Open Minecraft” , you will be transferred directly to Minecraft PE application
Step 3
In Minecraft PE:
1. Create a new map or edit existed map.
2. Scroll down and check on”Resource Packs” and “Behaviour Packs” for imported add-ons/maps/buildings/textures/seeds to activate it.