How can I change the image banner without altering custom codes?

[VitaVibe]

Hi, 

 I’m wanting to change my image banner for my landing page but keeps making me change “custom codes”. How do I go about that ?

website-  https://www.vitavibe.uk/ 

Anyway help will be appreciated! 

Thanks 

Vitavibe 

[VitaVibe]

Hi, 

Thanks for your response.

I purchased a pre built site so it’s classed as a general store. 

Thanks 

VitaVibe