To enter a temperature in the Kindara app, tap the C or F symbol at the top of the Data entry page (pencil icon) then use the keypad to type in the temperature.
Keep in mind that if the temperatures do not seem to be saving correctly, ensure that you're entering the decimal point as well as the numbers as Kindara doesn't currently add that automatically.
In addition, note that very low temperatures won't be saved.
How do I change temperature units?