@KBKM 

Firstly as Riley mentioned you should always be able to manually turn the floodlight on and off via the app. If you cannot then it's likely you have a faulty unit.

For it to turn on when you walk past it there are a few things to note.

Firstly it needs to be dark, they don't activate the floodlight during the daytime (or not that I'm aware of anyway). Secondly you need to check the settings for the floodlight to make sure you have it set up correctly for detection.

If you go into "floodlight settings" then "auto on settings" there you can set the "sensor" so you need to make sure you have a tick in the sensor detection area (I only have middle ticked as that works for me). Then set your sensitivity level. 8 seems to work good for me.

For reference I have "floodlight schedule" OFF. That means whenever it's dark and someone comes into the PIR detection zone my floodlight will come on (you can change how long it stays on for in the settings). If you wanted to set the schedule you can make it so it only comes on between certain times.

Hope that helps and you get it sorted 👍🏻