If you've utilised the temporary URL and would like to update it to your own live domain, then you can easily use the WordPress tools to update this.
To update the temporary URL to the live URL:
Login to StackCP using this Guide

How do I log into StackCP not created yet to link to that section
In the WordPress Tools section click the Settings icon
You'll then see the Site URL and Home fields, currently, they should have URL that looks something like http://example-com.stackstaging.com or http://example-co-uk.stackstaging.com.
Simply update both of these fields to your live domain, e.g. http://example.com
Select Save Settings.
Note: Ensure you update the hyphens (e.g. ' - ') to periods (e.g. ' . ') when updating the URL in order for the live domain to work correctly.
You should now be able to access your site at your live domain.
Note: This guide is aimed at users on our Wordpress Hosting packages
If you have further questions, please contact us at Midphase support.