The Holy Ghost can bless your life in many ways. Christ promised His Apostles that the Holy Ghost would "teach you all things" and "guide you into all truth." He also said that the Holy Ghost "shall testify of me."
Likewise, the Holy Ghost can help you. Through the inspiration of the Holy Ghost, you can recognize and understand truth and make right choices and inspired decisions.
The Holy Ghost can inspire you with thoughts and ideas, warn you, and comfort you in times of sorrow.
You may have already felt His influence at times in your life. That influence includes "love, joy, and peace."
Almost everyone has felt the Holy Ghost at some time. But there is a difference between experiencing the occasional influence of the Holy Ghost and receiving the gift of the Holy Ghost.
Although the Holy Ghost may temporarily comfort someone or reveal truth to them, the gift of the Holy Ghost is reserved for those who have been baptized and confirmed into Christ's Church. This gift is the privilege of enjoying the constant companionship of the Holy Ghost conditional upon keeping the commandments.
The gift of the Holy Ghost is given when a person is confirmed a member of the Church after baptism by someone having priesthood authority from God. It is given by the person having authority laying their hands upon the head of the person who was baptized and giving them a blessing to receive the Holy Ghost. Whether or not we then receive this great gift depends on our keeping the commandments of God.