DRG use a third party site to install and play mods
So you got to acsses this site to select mods https://drg.old.mod.io/?filter=t
https://drg.old.mod.io/?filter=t



To use the site you need to log in there with your steam account

Once there you can select the mods of your choice by subscribing them

Once you subscribed to the mod you wanted you don't need to download it from the site DRG has a way for you to manage the mods you subscribed in game

just go to the menu
go to modding







and the mods you subscribed will be there so you can install and manage the mods you want.
Activate then to download and install, you can activate then by marking the square with "X" beside the mod

Now you are good to go and have fun with your new meme mayhem, go wild.