Being a re-seller you might be in-trusted white label panel with your brand logo and website URL. this is not a up hill task you can make your white label reseller panel, so let start;
1. Login in to your re-seller account.
2. Click on administration.
3. Click on Site Branding.
4. Then click on domain pointing to point your domain or sub-domain.
5. Now click on reseller information tab to make put your logo, email address, contact details;
6. And you are done with the branding.
Note: Please make sure you point correct CNAME with your domain or sub-domain in-case you face any problem just speak to your domain service provider.