How To Change Logo in Magento Theme (Fortis):

1. Click on “System -> Configuration -> Design”  (In Admin Panel)

2. Click on “Header” Tab

3. View “Logo Image Src” where logo name is mentioned.

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1. Go to “skin/frontend/fortis/default/images”

2. Logo File is here with the same name.

3. Now Upload new Logo with same name.

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You can create new logo  name but you have to change in “System -> Configuration -> Design -> Header -> Logo Image Src” Also. 🙂