Put a couple drops in warm water and wet a rag in the warm water and apply it for a few minutes. You can probably wet a sanitary napkin the same way and apply it like that if you can't get up much.
You can also use it on cool compresses the same way (refrigerate the wet sanitary napkin for a while for the cool benefits

.
The nether region likes both warm (encourage good circulation, and promote healing) and cold (numb the area for pain managment and reduce swelling).
Or just fill a water bottle with warm water, add the drops to that, and spray the area when you use the restroom. Wait a minute or so to get some good effects then dry well.