The Filter is used for the Custom Reports of the Statistics Service, and it cannot be applied to the Standard Reports, included by default. You can create as many filters as you like.
The Filter can be useful above all to exclude your IP address from the visits your website receives.
To set a filter first of all you need to create one, from Settings>Filter Sets>New.
Create the new filter:
And click on save.
Go back to Custom Reports in Workspace, select the custom report you have created e.g. “Report Mario Rossi”, and then select the filters availble in the “Filter Set” dropwn menu:
Last of all select the filter which you wish to enable for the custom report: