iFrame target = _parent confusion


For various reasons my newsletter signup HTML form is accessed via an iFrame on my homepage. On completion of the form I would like the user to be shown a Thank You page. My problem is that this Thank You page is loading inside the iFrame box instead of the main browser window. I googled a bit and apparently I need to set target="_parent" but I know next to nothing about HTML and don't know where to put it. Can anyone give me any help?

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