Lyrics must follow notes in a midi track. This track is set aside in the midi song to be a "lyric track". I'm not aware of a program that is dedicated to handling this chore alone. Perhaps someone else is. There are dedicated notation packages like Encore and Finale that might be easier than using Cakewalk. While Cakewalk in a decent sequencer, lyrics and notation and not one of its strong suites. Sorry I couldn't be of more help.