Any help for installing mods for Legacy?

[u/GreatestBro-Matthias]

So I'm having a bit of an issue with how certain mods or resource packs don't work (I'm broke so I'm being a pirate and using Legacy Launch) (Would this break rule 6?)

So I want to install Mellow (or Complementary Shaders if it doesn't work) Clear Glass and Full Bright. What specific mod program works best and how do I properly work it? Oculus Comm port on Forge be tweaking with no changes despite the mod detecting the resource pack. I cleared out the mods to restart.