Most rabbits are very affectionate and already know that you love them but you can help the bunny gain your trust by giving him/her their favorite snacks on a regular basis and slowly get the rabbit to let you touch it and then hold it in your lap and pet it.
Some rabbits love it when you sit them in your lap and pet them and eventually the rabbit will begin to trust you.
Also avoid showing the rabbit off to a bunch of people because that can make the rabbit uncomfortable and want to avoid people including yourself.
And make the rabbit a house where it can go into hide when it feels uncomfortable.