Perfect - you'll be golden. If you haven't already, simply head to
www.tado.com/start > create account then follow the instructions.
If it's that which failed, you can either call or raise a ticket. IME they've been super quick to respond to a ticket, be sure to provide as much info as possible which will likely save you some back and forth (so when I did it for a mate I included their username, boiler model, the fact they hadn't got a thermostat already) and they sent back the instructions which were even so detailed as, step 1 'remove this screw' , step 2 'remove this panel' etc.
I've had my tado for about 15 months now and finally fitted my last tado TRV in the back room. It's been awesome for me.