How do i increase the post image thumbnail size

  • i tried all the possible codes
    but non of them helped me
    I use the theme bootstrap in my site
    link https://gagshere.heliohost.org
    i tried number of functions but none of them helped me
    my wordpress version 3.4
    How do i increase the post thumbnail size
    i want to be explained everything in detail
    your help will be highly appreciated

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