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On Printer, under Settings/Setup, select Maintenance and press OK. Then under Maintenance select Ink Cartridge(s) Replacement and press one of the Start buttons. Then life the scanner unit up and the cartridges will be positioned in way to be replaced. Squeeze the tab on the cartridge and lift the cartridge straight up to remove it and the install new one.
Follow the instructions in here --> http://www.epson.com/cgi-bin/Store/support/supDetail.jsp?infoType=FAQ&oid=252863&foid=268038
(Note : When replacing the cartridges, DO NOT try to move the head of printer with your hand)
Please let me know if that didn't work, so I will continue to help you