Once you have entered the Reporting page for any channel, you will see a list of your reports. To filter these reports, simply look to the right-hand side of your screen on top of the list of reports and you will see a search bar with a Filter button to its right.
If you know the name of the report you would like to view, type it into the search bar. The list will automatically filter as you type.
You can also filter your reports by date range. To do this, click on the Filter button to the right of the search bar and drop down menu will appear where you can select the dates you would like to search for. Click Apply and the reports will be filtered based on the date parameters you have set.