You can tap the Continue with Google button and select the Google Account you want to use with Moseiki. This will log you into Moseiki if you have an existing account, or if you do not, it will start account creation process.
Continue with Apple
You can tap the Continue with Apple button and enter an Apple Account email address you want to use with Moseiki. This will log you into Moseiki if you have an existing account, or if you do not, it will start account creation process.