Psi Mod Problems

Hey everyone,

I'm quite new at this Page & Minecraft.
I recently tested the Mods for the Servers you can start on this Page.
Whenever i try to join a Server that uses the Psi mod, it says FML Loader is needed or something like this.
How can i fix this?
Do i need an other Launcher to join the Server that uses a Psi mod?

Thx for all Help.

Ok i did that, but now it says "Mod rejections [FMLMod:autoreglib(1.1-4), FMLMod:psi(r1.1-46)]...
Im already so fked up coz i have to wait so long to try if this shit works.