First Activate your angel by clicking on it twice...
Then you will see an angel logo on the top left of your screen...
When you put the cursor in front of the angel logo you will see the exp of your angel...
The exp of your angel needs to reach 100% so that it will be ready from removing your desposition...
You can gain exp for your angel by fighting monsters...
But your angels exp will also depend on the exp that you are getting from the monsters that you are fighting...
The exp for you be will divided by maybe half for you and half for the angel...
When your angels exp gets 100% Go to the confession and finish the quest...
But the PK that will be reducted from you will only roll from 1-5...
If you still have PK you gotta get another angel again
What a Very Very Long Explanation