Setup DNS on Synology

I would like to setup a custom DNS on my Synology NAS (talkingfly.cloud). I would like this to work with my Synology Drive so instead of using links like this https://ryanwoodard.quickconnect.to/d/f/uwApNHQjrGLntUZf3LLMilj2sZhqQ they are more like this - https://talkingfly.cloud/d/f/uwApNHQjrGLntUZf3LLMilj2sZhqQ

I need all of the correct security put in place.