Can I make changes to the code?
Before you make any changes to your store, you should make a full backup of your database and files. That way, if you accidentally mess anything up, you can simply restore the working files.
If you are going to make any changes then please be aware that any future updates with the theme may well overwrite what you have done. If you are going to make CSS changes, then use a custom.css file to ensure they remain in place.
If the changes will be major code changes then we recommend you keep a note of what you have changed, so that when you update the theme in the future you can make the same changes again.