when i try to download it says " you need to run the version 1.8 manually at least once" what does that mean?

It means exactly what it says. Open the minecraft launcher, run Minecraft version 1.8, not 1.8.1, not 1.8.2, not 1.8.3, version 1.8, then close the game after it's finished launching and run the forge installer, choose install client. It will install it then.

i did but it still says that

Ok I can believe you because this happened to me last night, navigate to .minecraft/versions delete all 1.8 versions, and then try manually running 1.8 once and installing forge.

i dont know how to do that lol is ther a video on it or something?

You don't know how to go to a folder and delete it? How do you know how to play minecraft?

 

Open your file explorer, go to %appdata%/.minecraft/versions

Delete and folder in there starting with "1.8"

Run minecraft 1.8

Close minecraft

Run the forge installer

i do just caould find the foleder

i did as you said stil say samething

I honestly can't think of why, if you deleted all the 1.8 folders and then ran Minecraft 1.8 (Again not 1.8.1, 1.8.2, or 1.8.3) and then ran the installer it should work. Sorry, hopefully someone else can help you fix it.

esee i dint know i cant use 1.8.3 lol is that why it not work?

if do i how  get an older version mc?

run Minecraft version 1.8, not 1.8.1, not 1.8.2, not 1.8.3, version 1.8

 

Open minecraft launcher

Click Edit Profile (Bottom left)

In "Use version" Choose "release 1.8"

Save Profile

run minecraft

thak you thst worked

ok can u give me a quick leson on how to get mods lol

Simplest way to explain it, you put the mod in the mods folder.

%appdata%/.minecraft/mods

 

Make sure the mod is for minecraft 1.8!

If a mod says it requires another mod, make sure you install that mod too!