[header] How to make a todo list on your iphone [title] Invoke siri. [step] Press and hold your iphone's home button until you hear two beeps indicating that you can ask siri a question. [title] Tell siri what to remind you about. 
[step] Speak into your microphone (at the bottom of your phone) naturally as you would with another person, and with clear articulation. Say " remind me to buy milk at 6 pm.