Hi Kornchai ,
Welcome to the forums! 🥳
From what I understand, you would like to make the label of the 3rd button appear every 12 seconds.
Unfortunately, this is currently not possible.
We do however, plan to make much more options to Buttonizer so that you will be able to create the button that you want.
I'll add this into our feature request list. 😄
If I understood your question incorrectly, please let me know!