NRVE is listed on LATOKEN, Bilaxy and Switcheo. We have a blog posted that describes the step-by-step process for buying NRVE on LATOKEN and on Switcheo.
LA TOKEN GUIDE How to Buy NRVE
SWITCHEO GUIDE: How to Use Switcheo to Buy NRVE
LATOKEN and Bilaxy are centralized exchanges. Switcheo is a decentralized exchange.