Narrative Theme: Customizing Hamburger Icon

[CasaNiñas]

Hi! 
I am using the Narrative theme & am wondering if I am able to change the hamburger icon to a custom png I made ? I want the custom png to act as my new hamburger icon. So essentially changing the three little lines to a custom design. Is this possible to do & if so how can it be done ?? 

[Zworthkey]

Hii, @CasaNiñas 
Kindly share your store URL and a screenshot of your problem so,
I can solve it perfectly.
Thank You.