Need help creating new song

I have the midi and I translated the lyrics into Romaji, the peorblem is im having a hard time with the lyrics and pacing them into the midi my utau program keeps freezing everytime I try to add a letter and it's getting annoying to say the least I would be ever so greatful if someone could help me put this together I've been trying for four weeks to do it on my own and I have gotten no where fast thank you