You match the ohms in a delivery attachment to the voltage you use. The Vision Spinner can do voltages from 3.4 to 4.8 volts if I recall correctly. Use the below chart to learn how to match ohms to voltage.
Find the voltage range you typically vape with in the top horizontal column (3.4 - 4.8 volts). Staying in the green blocks below this, draw your attention to the far left column where ohms are listed. You'll see that the ohms you can use by staying in the green blocks for the voltage you typically use. Just make a right angle from the voltage column to the ohm column. Where they meet in the green blocks is the wattage you are vaping at. Now you know how to use the chart.
If you prefer a warmer vapor, pick a smaller ohm number. If you prefer a more cooler vapor, pick a higher ohm number. For another way to pick the voltage for a particular ohm, use the ohm number and add two (2.0 ohm + two = 4 volts). 4 volts is a good place to start, and adjust lower or higher to taste.