Flexible Solutions, Inc. – GP Reports Viewer
It is important that you test your report using the Preview tab to ensure that your report is working properly before uploading to the Report Manager and using the report with GP Reports Viewer.
Now you can publish or upload your modified report to your Report Manager.
After testing your report in the Report Manager it is recommended that you hide the GPServerName and GPDBName parameters before setting the reports up in GP Reports Viewer. Otherwise users will be able to see and change these parameter values when they run the reports. While viewing the report in the SSRS Report Manager, choose Manage, then click on the Parameters tab. Uncheck the boxes for Prompt User and check the boxes for Hide on these parameters, then click the Apply button: