Since it sounds like your sensor is working and you can see it responding in the “Status” tab, you probably do not need to use an external pull-up resistor with the PIR sensor you are using.
You can use a “GET_POSITION” command to read the sensor and process it accordingly. My post in this thread has some advice for starting a program with a button press that you might find helpful. It should be very similar to using a PIR sensor since it is just a digital signal. Please note that you might need to adjust the code in that post to work with your setup. For example, the channel number is different, and you might need to change the “greater_than” to a “less_than” depending on how your sensor works.
Brandon