I cant find the program/software sign in.
I'm not sure if I understand, so I'll provide a few answers in case one was closer to your question :)
If you're wondering how to login to this website, usually there is a login form at the top of each page. You can also click one of the links next to the login fields to create a new account or retrieve a lost password.
If you're wondering how to become a supporter, that just means someone who purchased beta access. To do that, visit this page:
On it, you should see the different ways to purchase NEO Scavenger, both on this site and elsewhere.
Let me know if you need anything more!
Dan Fedor - Founder, Blue Bottle Games