I´ve created already a website by the WIX-Creator Site.
Now i want to transfer it to WIX Studio to make my website more comfortable to watch.
Could somebody tell me step to step how to transfer it to Studio?
If by Wix-Creator Site you mean a website built in the Wix Editor, it is not possible to transfer the design of the website directly to Wix Studio. You will need to rebuild your website manually in Wix Studio. Wix Editor: Rebuilding Your Site in the Studio Editor | Help Center | Wix.com