selfprivacy.org.app

Log in at: https://desec.io/login
Go to Domains page at: https://desec.io/domains
Go to Token management tab.
Click on the round "plus" button in the upper right corner.
"Generate New Token" dialogue must be displayed. Enter any Token name you wish. Advanced settings are not required, so do not touch anything there.
Click on Save.
Make sure you save the token's "secret value" as it will only be displayed once.
Now you can safely close the dialogue.