XML & Excel 2010 - Why can't I export my changes?

Hello All,
I'm new to the forum, so please bear with me.

I have the following attached XML file and created the following attached .XSD through excel. My question is why can't I export my changes? And what can I do so that I can modify my changes?

I mainly want to be able to change all of the Flag attributes from "TRUE" to "FALSE" and vice versa if needed. I used the following module to create the .xsd file. Is this wrong?

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I am able to import my data just fine and it looks great. But I can't really use it if I cant change my data. Please help!