Hello Sinan,
I think what the reviewer is looking for is some sort of a discussion of what size of effects you were powered to detect, given your data. For example, it's possible that "meaningful" effects for your type of data and analyses are of X magnitude. Say, you were powered to detect effects of X/2 or X/10--then you can be relatively confident that you have a valid null result and it's safe to embrace your null hypothesis. I have no idea how to do this for VBM.
Good luck,
-Marina
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