This is totally not an ignorant question, on the contrary, a very wise one. Being able to see past lives you are able to more easily cut off karmic habitual tendencies and improve the quality of your present and future lives, and develop a "distaste" for reincarnation motivating the wish to liberate oneself from samsara.
Check out this link:
Check out the book:
Mindfulness, Bliss, and Beyond by Ajahn Brahm
it teaches a method for remembering past lives.
Good luck :D