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I want to know which file I should edit to change the header title from h1 to h2, and in single post discussion, to change the title to H1?
Header title can be found in your themes default.master view. This can be found in /themes//views/
Near the top somewhere there will be
if it is a smarty template and something I cannot remember if it is a php tmeplate.
The post discussion can be found by going through the views in the applications/vanilla/views folder. I am uncertain of the exact one though.
I am quite busy atm to look up all this for you and explain in more detail, but I am sure @422 can help you.
I want to modify the default theme, which doesn't have the 'views' category (for some reason)