Quest rewards

Where can I edit the quest rewards?

PS: Quest_template not contains those items, what the quest offers, and I want to remove them.

This is confusing me. Quest_template contains those items at RewardItem(1-4). Or do you mean something else?

Thank you so much for your kind reply!

This is the quest: https://www.wowhead.com/quest=14243/warchiefs-revenge
This is how it looks like in DB: https://imgur.com/kEusn6T and https://imgur.com/527MuMC

The sad thing is: I don’t know the quest where gathers those rewards, since theres nothing in the DB related to that items. Plus, the other characters able to complete the quest, only the Shaman can’t.