So you have downloaded Palringo and want to set up an account. When you first open the app you will be presented with the option to sign up. Choose that and you will be shown this message.
Choose a nickname then either click Join, this will create an unverified account, only one unverified account can exist on a device at a time and if you log into another account or make another one access to this account will be lost. So consider Verifying your account.