supportXMR.com Login - password question.

I have some questions about this system, maybe some of you can help me with that: 

* can somebody else (who somehow knows my wallet and guesses that i mine at supportxmr.com) set a password and mess with my settings?

* how to change the password after multiple miners are running?

* can I hide the mining results info, or set it behind a password?

* What happens if i change the password through the gui at supportXMR.com? Will my miners be rejected if it is still using the old password?