It's important to save your styles before making any changes. This way you can always go back to it when you try out a new template or make a mistake.
To save your style:
- Login to your Control Panel
- Click 'Presentation'
- Click 'Customize Style'
- In the next screen, scroll all the way down and look for the 'Style Name' section on the left
- Put in a new style name or change to one that's already there
- Click 'Save as new style'
- If you want to overwrite the current style click 'Save style' instead