In order to use BitShares, you will need to register an account. All you need to provide is an account name a password.
The identicon at the top can be used to verify your account name to third parties. It is derived from your account name and gives a second verification factor.
And this is how you register your account:
Note that, in contrast to any other platform you have ever used: Creating an account at one of our partners will make your account available at all the other partners as well. Hence, your account name can be seen similar to a mail address in such that it is unique and every participant in the BitShares network can interact with you independent of the actual partner providing the wallet.