Update modrinth_mac.md

Author: Axuras

docs/launcher/modrinth_mac.md

@@ -12,5 +12,37 @@ This guide will explain the install process for Modrinth, as well as how we can
 
 [Download Modrinth App](https://modrinth.com/app). It should automatically recommend the correct version to download (a `.dmg`). Once it is finished downloading, run it. It may warn you that it is an executable file and could be malicious. If so, Go to System Settings > Privacy & Security > Security, and click "Open Anyway".
 
+### Step 2 - Logging in
+
+After launching, it will then ask you to log into your Microsoft account so that it can log you into your Minecraft account. Follow the on screen instructions. It may then ask you to sign into Modrinth. You are not tied down to one method, you can link multiple accounts later. Modrinth will now guide you through how to use the app, please pay attention!
+
+### Step 3 - Creating a Profile/Instance
+
+This guide will focus on Forge 1.8.9, but steps for other versions should also be obvious.
+
+Click on the green `+` button on the bottom left of the app. Make sure the `Custom` tag is selected. Give it an icon if you wish, any name you want, and set the Loader to `Forge`, and Game version to `1.8.9`. Then press `+ Create`.
+
+### Step 4 - Installing our mods / SkyClient
+
+Now that we've installed Forge 1.8.9, we need to move all our mods to the new Modrinth App folder. To do that, we'll right click our new instance and press `Open folder`. A Finder window should open, this is the equivalent of your ".minecraft" for this instance. Now, open Spotlight Search by pressing `CMD + Space` on your keyboard and typing `~/Library/Application Support/Minecraft` (if you are using SkyClient, you then need to open the `skyclient` folder). Simply move everything in this folder into the Modrinth App ".minecraft" folder that you opened earlier. Once this is done, you should be able to see all your mods in the Content tab, and can launch the profile. The Content tab can be opened by clicking on the instance (not the green start arrow), and clicking Content on the sidebar.
+
+When downloading mods from now on, you can simply drag and drop them into the Mods tab in Modrinth. Additionally, if the mod is on Modrinth, you can download them within the launcher using the `Add content` button at the top right of the Content tab.
+
+### Step 5 - Explore
+
+Modrinth Launcher has a lot of things to offer, such as lots of options for your instances, and the ability to see all your mods & resource packs in the launcher before launching. You can use these menus to install mods and resource packs, and even update them if they are hosted on Modrinth! Please take the time to actually learn how the launcher works and experiment with it! Modrinth App is an incredibly powerful launcher and it's important to know exactly what you can do with it!
+
+## Common Issues
+
+#### `My mods arent showing up in-game!`
+
+There are 2 common causes for this, open the profile view (click on it or right click then `View instance`), then check the Content tab. If you do not see any mods here, [you should redo step 4](#step-4-installing-our-mods-skyclient).
+
+If you see a list of mods here then you should click the `Options` tab, then `Edit versions`, then make sure to choose Forge. Click `Save changes` and Forge should be installed, and the mods should work.
+
+<br>
+
+If you encounter any issues not shown here you should ask for help in my [discord server](https://discord.gg/rejfv9kFJj).
+If you encounter any issues **unrelated to this guide**, or you simply want to keep up to date with Modrinth, you can join their [discord server](https://discord.gg/modrinth-734077874708938864).