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As the other sIiiS mention the topic is old. But it is handy to put some answer here so mybe somebody else has the same issue and read the answers. In this way we can improve the Persian Magento commiunity.
1> If you need chage the \”Ghaleb\". I thin you want to use your own template. First you have to upload your template to your root directory e.g. by FTP. Then log in your Admin got to System>Configuration and at the left side choose Design.
Depend on the structure of your template fill in the required info. For most cases you fill for package: default and for Theme section for Templates & Skin & Layout & Default: \"nameOfYourTemplate\"
You can find the correct name for your template in directory /app/design/frontend/default/NameOfYourTemplate
2> Creating menu for Magento can be done directly editing the header.phtml (not recommanded way). Or creating a cms static block and applying it on header.
3> Your third question is too general. To explain that I need to put the whole tutorial on this topic.