how to change the mulligan setting for keeping the cards

[yunchenran]

I know there is a way to not to keep the card by modifying the "DefaultRoutine.cs", such as "_mulliganRules.Add(new Tuple<string, string>("mulliganData.UserClass == TAG_CLASS.HUNTER", "card.Entity.Id == \"DS1_184\""));"
But how can I keep the card I want?
Can somebody help me?