You can Submit lyrics through THIS PAGE you will need to fill all the fields and include your lyrics in Hiragana and Romaji. I recommend you to consider the following:
1.- Check all the fields.
2.- Prepare your lyric and information in a word or google docs where you can fix and save your progress.
3.- Once your lyric is 100% ok, copy and paste from your word or google docs to the SUBMIT LYRICS PAGE