Hi & How to close browser on htc vivid

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http://androidforums.com – Newbie here... it said to say hi... so "hi" :D I need to find out how to CLOSE a browser window... was using the back button and also tried task manager... but when I open internet... it reverts to last thing I looked at/browsed.... and somehow got myself locked out of chase banking site because it kept trying to log me in (invalidly)... Please help! gg33 :confused: (General)