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  1. go to Format ▸ Section;
  2. select the desired section name;
  3. uncheck the Protected box;
  4. if necessary, enter your password in the dialog that appears and click on OK;
  5. click on OK in the main dialog;
  6. make the desired modifications to the text; and
  7. follow the stages "Protecting a section of text" described above to reprotect the section.