In the report editor, under Access, select Password protected and type the password in the Access password field. Anyone who opens the link sees a screen asking for the password before any data is shown. When editing a protected report, leave the password field blank to keep the current password, or type a new one to change it. If you switch back to Public (no password), the protection is removed. In the reports list, protected reports show a Protected badge, and in the edit window the current password can be shown when available.