Log in to the host portal as a system administrator.
Go to Global Settings and select the Login Customization tab.
In the Edit section, type your custom message in HTML.
You can use the following HTML tags <a>, <br>, <div>, <h1>, <h2>, <h3>, <h4>, <h5>, <h6>, <i>, <img>, <p>, <span>, <strike>, <strong>, and CSS added using the style attribute.
The Preview section updates as you type so you can see the result:
When ready, click Save to apply your changes.
The custom text you added is now visible at the top of the Login page: