As you know all Demon Attunements and a few others receive a power word after you complete the attunement. In the past you had to request this in the customer support panel. From now on no requests are to be made anymore. The masters in charge of your attunement will upload the power word to your dashboard 25 days after the purchase when the 7 rituals are completed and it will also be send to your email.
It doesn't matter if you start the attunement later. Just don't use the power word untill you finish