Its more than likely your coil needs replacing which is causing the burnt taste just head on over to Lunar Vapes in Danville and they'll help you get a new one and show you how to replace it.
Its most likely the coil. You can either buy them from a vape store or order them off ebay (they are cheaper)
And I have no idea how to change it so I'll have to pay more to have the help. I'm new to vape so im clueless but I'm trying to stop smoking.
Thanks! Your answer is awaiting moderation.