Addax includes a child theme to make the updates easier.
If you are planning to do several CSS changes, it is highly recommendable to do these changes inside a Child Theme, so you will never lose these changes.
The steps are pretty simple:
- Upload addax.zip into wp-admin -> appearance.
- Activate Addax.
- After activated, you must upload addax-child.zip into wp-admin -> appearance.
- You can edit whatever CSS you want or PHP into functions.php.