Welcome to musicmaker!
Rule 1: Enter in each syllable, separated by a space.
Correct: Hi po Pot ta Mus
Correct: hip o Pott am Us
Wrong: Hippopotamus

Rule 2: Mark important syllables with a capital.
Correct: To day I Saw a li On

Rule 3: You cannot have more than two unimportant words in a row
Correct: To day I Saw a li On Ness
Wrong: To day i saw a Li On Ness

Rule 4: You cannot end with an unimportant word
Correct: To day I Saw a li On Ness
Wrong: To day i saw a Li On ness

Do note that the time signature is in 6 8 (6 quaver beats in a bar).