Play a note on the piano and use your tuner to check the piano pitch to see if it is in tune.
Sing the note that you played on the piano and try to match the pitch. Use the tuner to see if you are singing the correct pitch. Bend the pitch up or down until the tuner shows that you are singing the correct pitch.
Play the piano as you sing your music. Using the piano to aid you in the beginning is helpful to ensure that you get used to singing in tune and improving your pitch.
Practice major and minor scales daily to improve your ability to sing the correct pitches; use the piano until you can sing scales without it.
Play a note on the piano, match the pitch with your voice, and then bend the pitch slightly above the pitch and slightly below the pitch. When you sing out of tune, listen to the interference beats that occur between your voice and the piano. These beats let you know when you are singing the wrong pitch.