Some questions about fragments and prisms

https://preview.redd.it/ck0cpkbve9qe1.png?width=419&format=png&auto=webp&s=10967685d66796e906184a18c94c780e998ea567

I'm having a blast playing with friends. I'm trying to be a bulky healer/summoner. After researching prisms, I think I made some mistakes with what I slotted into them. I heard you want to pick some combinations that lead up to 4 different 'fusions'. Now, if I want these 4 fusions:
- Cleric - Healing Effectiveness + Use Speed

- Revitalize - Health Regeneration + Skill Cooldown

- Selfless - Revive Speed + Healing Effectiveness

- Tank - Damage Reduction + Armor Bonus

I assume I would have to slot in the combinations for these 4? I heard you want 2 for the first, 2 for the second, and 1 for the third? Is this correct?

Lastly, as you can see I think I screwed up with what I slotted in. the wiki says you can 'cleanse' your prism, which resets progress and removes the fragments. How do I do that?