The first thing to repent is to acknowledge and confess your wrongdoing. Take responsibility for your actions and admit that you were wrong.
Change your behavior. Repentance also involves making a commitment to change your behavior and avoid repeating the same mistakes in the future. This might involve seeking support, counseling or spiritual leader.
Ask forgiveness from those you wronged, and also seek forgiveness from God. Remember that forgiveness is a process, and it may take time for those you hurt to heal and for you to fully make amends.
Seek God and repent wholeheartedly everyday.