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I had the same problem just yesterday and here is what someone recommended which fixed my problem.
You have your default template to the XOOPS default which is not editable.
You need to go to admin>sysadmin>template. clone the default template and name it "whatever you want" (without the quotes). Then, go to admin>sysadmin>preferences>general and set your default template to your "whatever you want" template. click submit. then, log out, log back in. then go to the template. there should be a "Submit" button next to the "View" button.
Hope this helps.