Extension for Webpage fill with Java script

I need the extension used for topic. "How to fill out a form of a webpage and click a button using some JavaScript" I searched a lot but couldn't not find. Can anyone help me by providing the Link for the extension. I want to use the block for insert text .

Taifun hasn't used any extensions in that snippet.

Where can I find the block for inject.

You build the blocks yourself, using a procedure block

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The inject block is a procedure that you have to make yourself.
https://appinventor.mit.edu/explore/ai2/support/concepts/procedures

Ok, understood. Thanks a lot I will try.
Also thanks for quick reply.