Place your two palms together in front of your chest and recite the following in Pali or English (other language translations are acceptable too):
Buddham saranam gacchami.
Dhammam saranam gacchami.
Sangham saranam gacchami.
I take refuge in the Buddha, the teacher.
I take refuge in the Dhamma, the teachings.
I take refuge in the Sangha, the community.
Congratulations, you are now Buddhist.