With a Tiimo subscription you can have have up to 5 different profiles. You make a profile when signing up, but to create another one you simply go to the Me tab in the app, and choose Add new profile.
If on Android, you do the same thing as you do on iOS, you go to the Me tab in the app, and choose Add new profile.
You shift between calendars on smartphone or tablet by logging into Tiimo app and go to Me and then switch profile.