I have two labels for the data in my card's legend. How can I change the names?

Are you saying that the data you have has two different categories, or are you saying that you are seeing 2 different names for the same set of data?

In either case, you could fix this in the base data, or you could do this via beastmode.  If you only have 2 distinct data sources and just want to rename it, this is what I would use:

case

when `Label` = 'Old name 1' then 'New Name 1'

when `Label` = 'Old name 2' then 'New Name 2'

else 'Error'

end

The "error" field will let you know if anything falls outside of those two labels.

Hope this helps!