You can not use the Evince Document Viewer to edit files.
Phil Bull
philbull@gmail.com
Creative Commons Share Alike 3.0
Can I Edit Documents In The Document Viewer?
Evince can not 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 and PostScript (.ps) files are not usually intended to be edited, but PDF editing software is available. Try
pdfedit, for example.