If you don't know what Empires is please checkout this link to our Gamemode Description.
You should have already installed the necessary mods from this ressource to be able to install these mods.
Close the game again and open the installationpath of your minecraft. Usually its in "C:\Users\yourUser\AppData\Roaming\.minecraft".
There should be a folder called "mods".
Extract the .zip file and paste the content in that folder.
Start the game again and you should be able to join Empires.
Disclaimer: Medieval Realm does not own any of these ressources and thus is not in charge for anything that does not work properly. A text file with the original creators is included in the modpack. If you are a owner of one these ressources and are not comfortable how we refere to your ressource please contact us here.