The answer is quick but unfortunately not obvious. Go to the $:/AdvancedSearch tiddler (click on the magnifying glass icon next to the search in the side bar) and in that tiddler open the Filter tab. In the text box there enter a filter that list all the tiddlers you want to export (in your example the filter would be [tag[How To's]] ), below the text box you should see a list of all the tiddlers. Then click on the export icon to the right of the text box (it has an arrow pointing up) and select JSON File from the list that pops up. It should download a json file that contains all the tiddlers listed.
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