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WordPress requires tow functions to be called in themes. 

wp_head() needs to be called at the end of the header code - so would usually be found in the header.php file of a theme just before the 'head' tag is closed.

wp_footer() needs to be called - as it suggests - in the footer of the theme and is usually called just before the closing 'body' tag.

If in doubt look at the header and footer template files of any WordPress default/supplied theme.

Both calls are vital for plugins and are used extensively. Simple:Press will never work if one of these standard functions is not being called.

In the case of your site, either wp_footer() is not being called at all - or - it is being called but something is causing an error and stopping code from completing. If this is the case then you will find the cause in the php error log.