internet history search help?

i have a friend staying over for a couple of days. when we first enter the myspace page, it has my email, and password already in there in display. my friend isn't really a "trusting" person. he's more of a joker, or prankster. and he's been teasing me on how he's going to log into my account when i'm not looking. does anyone know how to delete my history from showing up. same for google, when i type a letter, instead of recommendation searches, it just shows my history of depending on what letter i typed. can someone please help me. i know he'll do something bad to my profile. this is a serious question, and thanks. you can get a best answer if you tell me
 
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