Hi DarrenceC. Device Management appears near the end of Settings > General. You will only see Device Management if your device has been configured by your employer's MDM system. It does not appear on normal users' devices.
If someone told you to delete a Profile from your iPhone, look for Profiles near the end of Settings > General. If you don't see it, then you have no Profile. If that's not it, please explain why you are looking for Device Management.