Ensure you are on version 8.x or highter.
To change the company logo on all user facing pages, perform the following steps. The logo displayed in the Administration Console is not changed.
NOTE: The logo should be at least 160x160px in size to ensure there is no loss of image quality.
2. If you have selected Enable advanced customization mode you need to complete steps 3 to 6 to update your customized theme.css file with the size of the logo.
4. To update the logo size used on the login page, locate the following rule in the theme.css file and update the width declarations to the required width for your logo.
5.To update the logo size used in the header bar on the portal pages, locate the following rule in the theme.css file and update the width declaration to the required width for your logo.