Thank you for your question.
To create a theme using the Theme Editor, you go to Theme Configuration > Theme-tab.
You can then either work with an existing theme (copy, edit, delete) or create a new one of your own, the create-button is located below the bundled themes on the Theme tab.
We have a tutorial on how to get started with the Theme Editor that you can find here: https://docs.refinedwiki.com/display/rwot/Tutorial%3A+Create+a+theme+using+the+Theme+Editor
Best Regards, Maria Heij
PS. If you need to extend your trial, visit myatlassian.com.
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