Adjust headlines to h2

Store Design
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1

Hello, some of the sections in my theme have h6 and I need to make them h2. Example attached. What would be the easiest way to edit them to h2?

Here's the shopify interface, maybe I can simply edit here?
Here's the shopify interface, maybe I can simply edit here?2246×1108 417 KB

Here's the example of headline which I want to edit
Here's the example of headline which I want to edit2926×1526 621 KB

Page:

https://holycup.lt/

Thank you!

2

Hello, thank you. It’s quite hard for me to locate the files in the code. Maybe you have any suggestions how I can search for them?

Thank you!