How to Change the Default Rendering on SSRSIn Feburary 2016 18,

In Feburary 2016 18,
Locate the report you will be creating a link to using the ReportServer portal in SSRS. Typically, this is found at http://servername/ReportServer. The interface will be minimal, but will display the same folders and reports as the Report Manager.
Copy the URL. Note that the URL may contain several parameters, but the part to look for is the report path, which can be found between the '?' and the first '&', if any exists. In the following example, the report path is '/Folder/Report%20Name':http://servername/ReportServer?/Folder/Report%20Name&rs:Command=Render
Create a new URL using the report path with some additional parameters to specify the rendering format. The 'rs:Format' parameter specifies the rendering format for the report. The following values are common for a default installation of SSRS: HTML4.0, MHTML, IMAGE, EXCEL, PDF and CSV. The 'rs:Command' parameter set to 'Render' instructs the report server to render the report in the specified format.For example, for a URL that always renders the report as a PDF document, use the following:http://servername/ReportServer?/Folder/Report%20Name&rs:Format=PDF&rs:Command=Render
Render a report as an Excel document this way:http://servername/ReportServer?/Folder/Report%20Name&rs:Format=EXCEL&rs:Command=Render
In Feburary 2016 18,