Can anyone help with Twicet theme?

I just purchased a copy of the Twicet theme and I’m a little stuck.

I’m a photographer not a web techie so please bear with me.

How do I go about changing the logo on the theme to my own? I’ve managed to edit some of the theme files under ‘appearance’ and ‘editor’ but cant seem to find the appropriate section for the banner / logo area.

Any help would be much appreciated.

Bare bones of my site here