Epson Stylus Pro XL Setup And Software Manual page 22

6. Open the foil ink cartridge packages and remove the
cartridges. Then remove the tape seal from each ink
cartridge as shown below.
Caution:
You must remove the tape seal from the cartridges.
Leaving the tape on will permanently damage them.
7. Lower the cartridges into their holders with the label facing
up and the arrow on top of the cartridge pointing toward
the back of the printer. The color cartridge, which is larger,
goes on the left. Install the black ink cartridge on the right.
color cartridge
black cartridge
Installing the Printer 1-9