Go to Launch Options --> Click on the version you would like to run Forge on --> Open the version pick spoiler --> Scroll all the way down --> Pick the Forge version you would like to use.
If you do not have a Forge version installed in your 'versions' folder, Download the Forge version you would like to use --> Install the libraries --> Follow the primer steps.
Hope this helped ya!
Well, what is the actual purpose of Mojang creating the EntityPlayer::addVelocity(double... x, double... y, double... z); method if there is EntityPlayer::motionX, motionY, and motionZ? They are almost identically the same.
I don't see what you mean here.
You're either talking about
player.getActivePotionEffect(MobEffects.JUMP_BOOST)
or
player.motionY
I don't see anything I called twice. Be more specific please?