I hate to say it, but I don't think you can, as it states in the owner's manual of the c5500, "the menu indicators are given in english only" and "since the menu is likely to change based on destination or for other reason, it is not disclosed to the end user".
I'm thinking you may have a machine that was destined for a spanish speaking person or area.
The manual is available here:
http://printelogy.net/Oki%20Manuals/C5500-C5800-C6100_Service%20Manual.pdf
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