Okay, I think I've got some of parts covered, my friend showed me this part, but after that I don't get it.
The GIMP version I have right now is 2.4.5
So here's what I learned so far.
Use the paths tool to to select the image you want to render.
Than hold ctrl after you almost done and use your mouse to press the first dot that you made.
Go to Dialogues, select layers, than right-click your current layer, than click 'add alpha channel'
Than click 'Selection from path'
Hold Ctrl, than press 'i'
Thats All I have so far.
I'm -Suppose- to than hold down Ctrl, than press 'K'. It's -Suppose- to removed everything else other than my wanted Render.
But it's not doing that.
And it's REALLY annoying me and my patience. >=[