"Beta 1 is closed to new registrations, and we're already working on phase 2.
We've had a LOT of feedback, and gained a lot more knowledge on how people interact with the wallet. Thanks a lot, and beta 2 will be up soon. We need your help to move forward, and apologise for this inconvenience.
To support POS there's some fundamental changes required to the web wallet and we need to do this with a clean slate. If you have zero balance you don't need to do anything.
Please enter an external (not on this wallet) wallet address where we can send your SIGT balance so we can move forward with beta 2.
Please stop mining to addresses on this wallet, so we can get your balance returned quickly.
You'll be able to login and check balances here, and we'll notify you when your funds are returned, which will begin happening from the 11th September."

I think you wont,if you have keys of your wallet,but you must contact support,they will answer you