Disclaimers
I’m guessing you already installed java, downloaded prism launcher from https://prismlauncher.org/download/ and that you already logged on your Microsoft (Minecraft) account.
Guide start
When you fist open the app it should ask you to set up java, which you should already have installed, log into your Microsoft (Minecraft) account and your language.
Then you should be greeted by the main screen which would look similar to this
Firstly you want to go over and add a new instance with this button
Make sure to click on the “Modrinth” tab
After clicking on it you should type “Slore SMP” on the Search and filter bar, you should be able to see the modpack
Make sure to install it by selecting it and then clicking the OK button
Once you installed the modpack your main screen should look like this
Now make sure to double click the icon and wait for it to launch, it takes around 1 minute to load, probably less if you have a good computer.
Once it loaded you should be greeted by a screen that looks like this
Click on the “Multiplayer” button
Make sure to select the server and click “Join Server”!
After this you should be in the server and are free to play! Make sure to follow the Rules!