You can't use Document Viewer to edit files.
Phil Bull
philbull@gmail.com

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Ελληνική μεταφραστική ομάδα GNOME
team@gnome.gr 2005-2015
Στυλιανός Παπαναστασίου
stelios@dcs.gla.ac.uk 2005
Μιχάλης Κοτσαρίνης
mk73628@gmail.com 2010
Δημήτρης Σπίγγος
dmtrs32@gmail.com 2012, 2013
Θάνος Τρυφωνίδης
tomtryf@gmail.com 2014, 2015
Mαρία Μαυρίδου
mavridou@gmail.com 2014

# Can I edit documents in Document Viewer?

Document Viewer can't be used to make changes to documents. You need to use the appropriate editing application for the type of file you want to change.

PDF files are not usually intended to be edited, but PDF editing software is available. Try LibreOffice Draw or Okular, for example. Furthermore, pdfarranger allows rearranging or removing pages and merging files.