Why is the spreadsheet locked?
The spreadsheets contain many complex algorithms and some cells are locked (with a user-specific password) to prevent accidental modification to the formulas.
Disclaimer: while we do our best to integrate new feature requests, we are unable to provide warranty or support for any custom modifications outside of the scope of the logbook features. This also applies once the spreadsheet is "unlocked".
We recommend re-locking the spreadsheet, once you are finished customising your logbook, in order to avoid accidentally modifying formulas in the future.
See also: Support Limitations