Use HJKLUIO to toggle segments of the top part, and the same letters but with the space bar held to toggle segments of the bottom part.
A quick little thing I made to help catalogue all the characters in the fictional script of the game Tunic. It generates a unique name for each character so that they can be more easily catalogued in a huge spreadsheet. I later found out that the actual writing system is MUCH simpler, so this way of translating it is unnecessarily complicated, but I'm keeping it up for historical purposes in case I want to look back at the spreadsheet.