Re: 360 PLUS SECCURITY on lg ph.can"t get rid of
What places in Settings are those? Have you tried Settings, Security, Device Administrators? If the app is mentioned there, make sure it is unticked/unchecked.
Also, try Settings, Apps, All, scroll to that app, and, since it was probably pre-installed, Clear Cache, Clear Data, Force Stop and Disable it.
https://forums.androidcentral.com/showthread.php?t=409154