How to get the Rinnegan
1. Be an Uchiha
2. Find somebody who you really love and kill them
3. Now since you have done that you have unlocked the Sharingan and because of too much trauma like Obito (went straight to MS and skipped 3 Tomoe)
4. Find a. Uchiha related to you
5. Exchange eyes with them and boom there EMS.
6. Now find an Uzumaki or Senju and have 8 kids with them. Now 1/8 chances your child will receive the Rinnegan
7. Kill him/her at birth and take their eyes.
8. You know have Rinnegan
9. Use Rinne Tensei to revive your son/daughter
10. Now they have Rinnegan and your dead
Thanks for reading comment below for any questions.