Setting up other modpacks (.mrpack format)

Have Prism Launcher installed
Download the .mrpack file
Drag the mrpack into prism launcher
Leave this as is and press OK
Wait for stuff to download
If you see this dialog, check the box and click ok
You should now have it as a visible instance in prism launcher that you can edit and launch
Appendix: if you want to set up shaders
it might break some stuff in the pack but if you wanna try
Edit it
Mods -> Download mods and install Sodium, unless it is already installed. Also install Iris Shaders
Shader Packs -> Download packs
Pick something you like (I'm using Solas Shader on my neoforge server by default)
Note you can download and add shader packs while the game is running so you can try out more stuff
Ingame to select shaders,
Press esc and go to options
Video settings
You should see iris on the left side
Shader list should look like this, click one and apply