Hello fans and followers of the Minecraft Ore site, today I will do a somewhat different tutorial (How to Download and Install Minecraft 1.12 on Mac OS using original Launcher and Launcher Free). As of today we will be starting a new type of tutorials for our site, we will bring tutorials for players who use the Mac operating system, if you like this type of content, please comment below so we can know your opinion.
First, make sure that Minecraft Forge is actually installed. You can check by starting Minecraft, and checking if there is a button labeled 'mods' on the title screen. If there isn't, then your problem is with the way you installed Forge. If you do see the button, you can enter your.minecraft folder and create a new folder called 'mods'. Then copy and paste all mods there.
However, you mentioned in the comments of your original post that you already did this. You also mentioned that you are installing a mod-pack and not a mod. Depending on which mod-pack you are installing, this process could be completely different.
If the mod-pack was designed for the, you can simply download that launcher and search for your mod-pack from within it. This will automatically install it.
If your mod-pack was not designed the Technic Launcher, check the page where you downloaded the pack from for additional instructions. If you still can't figure it out, try searching both Google and YouTube for Mod-pack name install.