Triage N'ko is for sending and receiving email in N'ko script.
The user interface is heavily swipe based. For instance, to switch between N'ko and English keyboard, swipe down on the blue stripe on the keyboard. All the other swipes on the keyboard have functions. For instance, the pink stripe is for digits, and the green stripe is for punctuation.
Experiment! Swipe on the bottom bar to navigate left and right between pages.
On the last (rightmost) page, there is an extensive help system. If you have any questions or comments, use the "Send Feedback to Eatoni" button on the help page.
Please also download Eatoni's TwTool N'ko app which has help text written in N'ko, much of which is relevant to this app also.