A problem to make a button visible on click

Hi guys!
I have a little problem with my code.
https://pastebin.com/d37EZi5Y
In this code there is an invisible button, and I would like to make it visible by the "Remove the invisibility" button. But it doesn't work.
Can you explain me why?

Comments

[isrikanthd]

Here is the code you want
del.dog/tasuboqoqe

[Si]

Please review the sidebar and restructure your question. The #help tag will be removed in 24 hours if not done.