WNR2000v2

I have a Asus RT-AC66R main router. I would like to set up my WNR2000v2 as a wireless repeater, I have updated to the most current firmware. I thought I was somewhat computer literate, until I started (3 days ago) to try and accomplish this. Lol I have searched and watched and reset  50 times if I have done it once, any step by step help would be greatly appreciated.