It's a great initiative even we have topics providing the necessary info of each campaign.
In the sign up option, the "Register" button doesn't work.

Thanks for pointing this out. I have the same error from my side using two different browsers.

This is my first time visiting the website. I think those details are displayed once the error above is resolved.
There is no maximum number of posts required.

I don't also see a valid reason to create an account.