I currently on the Standard Edition

Problem 1 

How do I do this, public sharing on the web?

https://www.zoho.com/creator/help/application/application-sharing.html#Make_Public_to_all_visitors_over_the_web

I don't see the option in my account.

Problem 2

I know the maximum published component is 3 for Standard edition.

But what is the limit for Professional and Enterprise?

Problem 3

I try upgrading my subscription by selecting Professional edition and upgrade, but all that happen is the page submit, load for awhile and then I am back to the subscription page, but the Standard edition column is selected again.