It is a prevelant undertaking for those that croon, that they strive to learn how to sing better and also to optimistically better their vocal range. Possibly you aspire to musical stardom or perhaps you just want to sing better for karaoke and perhaps embarrass yourself less.
Basically there is no easy fix - sure some interesting vocal exercises can help but the true means to singing success lies in untold practice and experienced supervision. Persistence and patience are your greatest tools.