When you've registered, it is best to add a profile picture, which will show on your chats with the models. This is easy to do.

First of all, log into your account. Then click on the account icon you have at the top right-hand side.

This will open up this screen, where you can change and see many sections of your account:

Click on Customize and you will move on to the next screen:

When you click on the Upload Image button, you will be taken to another screen and from there, you can add your new profile image.

Once completed, you'll see the first screen again, now with your new image ticked.

Click the button marked Save Customization, at the bottom of this screen:

You'll now have seen that your profile picture has changed to the new one.

Now you know how to change your own profile image.