1. Download and set up the Mod Manager here - http://www.nexusmods.com/dragonageinquisition/mods/116/?
Make sure to read the warnings on the Mod Manager page.

2. Download this mod.

3. Put the folder you downloaded from this mod into your mods folder you made when setting up the mod manager.

4. Open the mod manager and merge the mod you downloaded from this page with the official patch and any other mods you want.

5. Create a new folder in the Update folder located in your Dragon Age Inquisition folder
or if you already have a folder you created for another mod you will need to delete that folder and create a new one.

6. Once you have a new folder for the mods, select that folder and save the package.mft inside of it.

The mod should now show up in game.