"Thank you for confirming that you have secured your email account.
We have sent you a new password via email and enabled access to your profile page so that you can confirm your identity. Please complete a very quick and simple verification using the Poloniex app for iOS or Android."
Or you can simply ignore any links in this message and download the application from Google Play or the App Store.
I advise contacting their customer service, as they will provide you with the necessary and confirmed details through the online chat. By following their instructions, they can help you unfreeze your account.
UPDATE: Please check out this topic posted by @Rikafip today: Poloniex hacked, $100M+ stolen