
Customize Styles or Application Title
Microsoft does not support customization of the Report Manager style sheets. However, if you have expertise in Web development, you can modify the styles at your own risk. For more information about which files contain style information, see Customizing Style Sheets for HTML Viewer and Report Manager.
Report Manager has an application title that appears at the top of the page. By default, the title is SQL Server Reporting Services. This title can be customized. To change the title, use the Site Settings page in Report Manager. To modify application settings in Report Manager, you must be assigned to the System Administrator role to set properties on the Site Settings page. To view the application title, users must be assigned to the System User role.

To modify application title
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Log on using an account that is assigned System Administrator permissions on the report server.
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Open Internet Explorer.
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Enter the Report Manager URL. By default, it is http://<your-server-name>/reports, but if you installed Reporting Services as a named instance, the default URL will be http://<your-server-name>/reports<_instancename>.
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Click Site Settings.
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On the General tab, in Name, replace SQL Server Reporting Services with a different name.
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Click Apply.