Fortunately this only needs to be done once:
Open the settings page on Morpheuz and scroll down to this bit:
Go to the Pushover Dashboard:
Initially you will need to register an application:
Once you have created it, then it will look like this, if you click on the name from the dashboard:
Once you have entered the user and the token (both case sensitive 30 character long keys) and pressed save Morpheuz will be ready to go.
"Last result" shows what happened last time it attempted to use the Pushover user and token. If you re-enter settings, don't worry if this says 'Disabled', until the next export time.
Export happens at least 9 hours after you have reset it for bed time. If you have shut Morpheuz down then it will come alive for 5 minutes some 10 hours after you've reset.
Providing you already have a watch full of data, you can test using the resend option.
For those of you curious as to why this approach was taken, feel free to have a look at the Pushover FAQ.