How can I take care of my rabbit that he's runny nose and he's snezzing a lot I whated to know what can I gave him to be batter

Unfortunately, if he does indeed have rabbit flu then the prognosis is not good at all. The mortality rate is very high indeed. He need to decided if it would be better to end it's potential suffering earlier rather than later..

Have you had a diagnoses from a vet on this ?

How can I take care of my rabbit that he's runny nose and he's snezzing a lot I whated to know what can I gave him to be batter

You think your rabbit has a cold? Or the Rabbit flu? Have you taking your rabbit to a vet?

If it's serious then taking it to vet would be best and keep yourself also safe the flu may also harm you.