Epson Y465ss127mo - Manual (Page 143)

4. Turn the ribbon-tightening knob on the ribbon cartridge in the
direction of the arrow.
5. Hold the ribbon cartridge while gently squeezing the two ridged
plastic tabs together; then lower it until it snaps into place. The side
hooks in the printer should fit into the slots on each side of the
ribbon cartridge.
Maintenance and Transportation
5-5