I think you just need to register here https://nash.io/referrals?code=JBf8iP
And share your link to other people to earn tickets (and maximize your odds)
1 - Yes, the extension will not be connected with the beta and more important the beta is running on internal networks, so you will create accounts just for testing. Our goal with the beta is to get user experience feedback.
2 - Yes, and you need a referral code like @Vic9t said above.
You must open an account with the referrals link like as https://nash.io/referrals?code=2D67yK , without referral code you are not allowed to open an account. So just use the referral code and open an account to test the beta of Nash exchange.