I'm pretty new to this whole recording software thing.
How do I record on FL studio using guitar rig 3?
Like, I don't know how to open gr3 on FL studio 8, any help?
On the mixer in FL there's a drop down list where you select effects like the Fruity Limiter etc. At the very top of that drop down list it says "More...". Click that and there should be a huge list of VSTs. Guitar Rig 3 is somewhere on that list. Double click to open it.

Back in the mixer it says "IN" at the top right. It's probably set to "None". Click "None" and select the input your guitar is connected to. Hope this helps.