video: How to change ink cartridges

Compatible catridges are Epson 1811 (black), 
1812 (cyan), 1813 (magenta) and 1814 (yellow).

video: How to run a print-head clean

Epson XP-422 User Guide download

If you want to print two pages back-to-back on a single sheet (but for some reason the "2-Sided Printing" option is not appropriate), after printing the first side reinsert the paper into the paper-feeder with the top of that page downwards (or the intended top margin of a second landscape page to the right), with the blank back of the paper facing towards you.