I cannot find "personalize" under "settings".

[AC Question]

I want to use a 3rd party launcher for my HTC One M8 but "personalize" is missing! Help please

 

[Aerobane]

If you want to use a third party launcher just download the launcher and open the app.......

 

[AlphaTango414]

Re: I cannot find "personalize" under "settings".

Download one of many launchers available from the Play Store. After it has been installed, the next time you hit the home button a message at the bottom of the screen will pop up asking which launcher you want to use. In your case it will list HTC Sense or what ever other launcher(s) you have installed. Tap on "Always" and then select the launcher you want to use for the time being.