When you initially create a tile, it contains all of the original source data. It therefore is important to filter your data according to your needs (whether it is on date, or some other miscellaneous category).
In this example, we'll use a tile that's being built, which contains a fields called "Tier". This field contains discrete values of "Gold, Silver or Bronze":
If we would only like to see "Gold" customers, then we start by clicking on the "Filter: button:
This will bring you to the filtering screen:
Simply select the "Tier" Column. Ensure the Comparison is "=", as we want an exact match. Then, in the Value cell, select the "Gold" option:
Once you are ready with your selection, click on "Add". You will see only the "Gold" values are showing:
You can now add this filtered tile to your Dashboard selection as normal.