For all Joomla 3+ templates built using the Zen Grid Framework v4 (any theme after October 2014) please refer to the Zen Grid Framework v4 documentation.
Overview
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Logo file folder
Joomla 2.5 changed functionality so logo has to be placed inside Joomla folder/images or its subfolder! There is no more possibility to place logo inside template folder and select this logo image inside template setting->Appereance->Logo.