I've been trying to change the layout of the page using this tutorial:
however under new design of the confluence i can't seem to find the stylesheet option in the menu. Could anyone help me with it?
The article you're referencing is meant to be used only with Confluence Server.
In Confluence Cloud, you're only able to edit the PDF stylesheet, and add a header and footer using basic wiki markup.
There is a feature request to be able to hide the "Created by" text, so I would recommend that you vote on it and watch it for any updates:
Let me know if anything is unclear.
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