We abide by receiving Jesus. He who eats My flesh and drinks My blood abides in Me, and I in him. (John 6:56). "Eating" and "drinking" is a vivid picture of partaking of or receiving Him, as John noted in John 1:12 "But as many as received Him, to them He gave the right to become children of God, even to those who believe in His name."
We abide by obeying Jesus. If you keep My commandments, you will abide in My love; just as I have kept My Father’s commandments and abide in His love. (John 15:10)
We abide by confessing who Jesus is. Whoever confesses that Jesus is the Son of God, God abides in him, and he in God. (1 John 4:15)