Took me a bit to figure it out. Each row is an attempt. I'm on mobile so after you put in a five letter word you need to tap on the "enter" key which weirdly is on the left side of the virtual keyboard. Once you press enter it will show you the results of that row and you keep trying for the remaining rows.

Type a 5 letter word in. It must be a real word (in its word list). The letters will be highlighted according to the instructions it pops up on load. You can then try another word. 6 tries to get the right word.

The fact that each try needs to be a real world is not stated in the instructions, which confused me too.