If you're recording your temperature in Fahrenheit and would like to record your temperature to two decimals, you can change your temperature settings by tapping the More icon in the bottom right hand corner of the screen, then tapping Settings, then tapping the .00 next to 'Temp Decimals'. This will allow you to record your temperature to the 1/100th decimal.
Tap the .00 next to 'Temp. Decimals' to record your temperature to two decimals
However, keep in mind that when charting in Fahrenheit, it's not necessary to chart to two decimals to get an accurate reading. In Taking Charge of Your Fertility, Toni Weschler recommends that you don't chart to two decimals, as it can be confusing when trying to detect the temperature shift.
If you're charting in Celsius, you do not have the option of recording your temperature to the 1/10th decimal. This is because when charting in Celsius, you need to record your temperature to the 1/100th decimal to catch the temperature shift.