First you need to log into STORM
Once logged into STORM, you will be taken to the STORM dashboard.
From the STORM dashboard, click on Websites.
Click the cog icon next to your website to manage your website.
Click on Databases
Click on the PHPmyAdmin button
This will open PHpmyAdmin, click the + to the left of the database to expand the tables
The table you need is the core_config_data which is usually around page 3 click on the table and not the +
For Magento 2.x change the web/unsecure/base_url to the new URL by double click on it typing the new URL and hitting Enter.
For Magento 1.9 change the web/unsecure/base_url & web/secure/base_url to the new URL by double click on it typing the new URL and hitting Enter.