Try this following steps :
How To Remove The Banner?
To remove the banner link to the Bitnami Info page, follow these steps:
Log in to into your server console using SSH and execute the following command. Remember to replace APPNAME with the actual name or directory location of your application.
sudo /opt/bitnami/apps/APPNAME/bnconfig --disable_banner 1
Restart the Web server.
If you're using Apache, execute the command below:
sudo /opt/bitnami/ctlscript.sh restart apache