As I had some questions why you cannot mine directly with your wallet as username on suprnova:
Suprnova uses a different backend for the pool than the others. You need to create an account first by signing up and add workers as described in
https://scash.suprnova.cc/index.php?page=gettingstartedIt's a one time registration, you just need an email and you then have for example idle worker notifications etc when your rigs go down, you can payout Everytime you wish etc.. it's simply different

I hope the link above to the getting started instructions will be linked at the op
I'd also add that suprnova has been around for a while and do a great job managing their pool and take the percentage pool fee without any 'hidden' extras you might get with less well known pools.
Also, you can start mining on suprnova without a wallet, then transfer to your wallet later once you have it setup. So it does have its advantages.