how to change passcode for my notebooks

hello how can i change passcodes for my notebooks if i forgot them and cannot get any answer on mail because i dont have access to that one that i attached to my notebook account please help :(

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Migrate your Notebook data to the new, mobile Notebook.
Zoho Notebook is transforming. The new version will include exciting new features and a completely new user experience. The initial version will be mobile based, available for Android and iOS. A new web version will be available after the initial mobile release. With the release of the new Notebook approaching, we're migrating most of your current data to the new version. Once the new version is released, there will be an additional window to migrate your data. We will not provide access to the