You can use the official Element server and/or Matrix server. But this tutorial relies on services hosted by me. A more detailed description can be found here.
First, open the website of my Element server.
If you want to login/register from another Element server or in the App make sure you have set the homeserver url to https://matrix.420joos.dev.
Log in or register. Make sure you don’t forget your username and password.
If you signed in, verify your new device with an older one. A pop-up will you remind you.