How to avoid someone from stealing your username

hey peoples this is what i think.i don't say it is 100% working.bt think it is a very easy way.
Everytime when you are about to log onto mig,many things takes place.so,the best and easiest way to avoid your username to be stolen,do dis=>
1.go to your phone browser,delete cookies & clear cache.
2.from your phone browser go to settings,then select cookie,then reject cookie.
3.you can now go to your mig33 and open it.
4.do not save your password,but enter it everytime when u log in to your mig33 account.
Hope this idea works.thank u all.