I found an iPhone 6 and when I try to completely erase and reset it, it says I need an iCloud password how can I bypass this so I can reset?

I found an iPhone 6 and when I try to completely erase and reset it, it says I need an iCloud password how can I bypass this so I can reset?

You can't. ICloud lock can't be bypassed.

YOU don't. And once the owner reports it stolen or lost, you won't be able to activate the phone, even if you could bypass the iCloud lock.