To create an account using the device's currently signed in Apple ID, clicking "Sign in with Apple" will bring up a confirmation dialog "Do you want to sign in to Numbers Station with your Apple ID "username@domain"?"

Note: the email address associated with your Apple ID is NOT shared with us.

Click "Username" and then "Create Account".  Enter a username, this does NOT need to be an e-mail address and in fact it is preferred that it not be. For example, jimmyssecretaccount is a valid username.  Then enter a password of at least six characters in length and reenter it again to confirm and click the "Create Account" button underneath.

Because usernames are not tied to any personally identifying information like an email address or phone number, we cannot reset a forgotten password.  If you forget it, access to your account is lost forever.

Once your account is created and you are signed in, you are brought to the main Chats screen. To find the Numbers Station address tied to your account that others will need to message you, click on the settings icon (gear icon, bottom right). Your address is at the top (see the arrow) under User Info.  Press and hold the address to bring up the Copy or Share dialog which will make it easy to send to others.

Scroll down in the settings screen to see your subscription options.  If you have not already used your 1 week, text only free trial, the option will appear in the "1 Year - Text Only" option.

Click a price to initiate the purchase of the associated subscription.  After a few seconds the confirmation dialog will appear. None of your personal or payment details are shared with us, just confirmation of successful subscription. Once a purchase has been made it may take a few more seconds for the app to receive confirmation and update the subscription status.

Click on the chats icon (bottom left), then click on the create new message button (top right, see arrow).  Copy and paste the Numbers Station address that you want to send a message to in to the "To" field and then select "Non-OTP" Conversation Type since you have not yet exchanged the Quantum Safe OTP material required for OTP conversations.

You can now start sending messages or files/video/images/etc. (click the paperclip icon).