The Reference Element's purpose is to add a number to compare your final roll results against.
The Reference Element can be found in the Element Library under the Gameplay View.
This is how a Reference might look on a Sheet in a room. While this feature can be used for any game, below is an example of how to use a Reference Element as an Armor Class in Dungeons & Dragons.
The Reference Element, when added to the Sheet Editor, can have a Label and description which are both only editable in the Sheet Builder. The Element itself can be edited and changed in the Game Room
To access advanced settings in a Reference Element hover over the upper right-hand corner of a Reference Element located in the Sheet Editor. Upon hovering your mouse over it, you should see a gear icon appear which will allow you to access the advanced Reference Settings which include: