Epson EPL-5000 Guide De L'utilisateur page 561

Be sure to click on the Measurement Unit pull-down menu even if you
do not want to change the unit. Otherwise, you will not be able to
select the dimension values in the Size block.
4. Click on the dimension boxes in the Size block and input values for
the horizontal and vertical dimensions of the paper you are adding.
5. After you are finished, click OK to return to the Main window and
save the new paper size.
Note:
Clicking OK in the Paper Sizes window saves the new paper size,
even if you click Cancel in the Main window.
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Printer Driver Configuration