Sorry, I think you must’ve misunderstood something. You do not ever need to hit tab to see anything. The mods option will just be present on the main menu. If the guide is too difficult to follow I highly recommend using the installer instead (assuming you are on windows). Otherwise manual install is very simple. You just copy the folder with the mods into the folder of fear and hunger and click “replace matching files.”
Link to install guides with videos: https://mattiefm.github.io/FearAndHungerModManager/tutorial-install.html