[How to install Minecraft Forge if it come as .jar file?]

Even I try to download it in other way

Well still came as .jar flie

TwT

[How to install Minecraft Forge if it come as .jar file?]

I download Minecraft Forge 1.12.2 and it come as a .jar file

I try to find video that fix this problem but sadly they don't exsit

I need help a lot just to fix this problem

Please Help!

(Also sorry for bad english)