Without a screen shot of your blocks, the forum members have no clue. AI2 does exactly as it is told (usually) so you are not providing proper instructions or a correct link to the file.
Do or read this stuff and you will know what is wrong. especially the link on Controls ... you need to read about the File control perhaps?
MITs tutorials http://appinventor.mit.edu/ explore/ai2/tutorials.html
TinyDB
ABG's example https://docs.google.com/ document/d/ 12t4HLNRepCnbmcfycdF8wSHWht_ D1P8hKJpTknVDChY/edit demonstrates filtering
Stephen's example https://sites.google.com/ site/stevozip/home/AI2/tinydb
Concepts
Other stuff (Activity Starter etc) http://ai2.appinventor.mit. edu/reference/other/
AI2 free online eBook http://appinventor.mit.edu/ explore/ai2/tutorials.html ... the links are at the bottom of the Web page.
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