Final answer:
To filter a contact list, you should click the 'Filter' or similarly labeled button in the application and then specify your filtering criteria.
Step-by-step explanation:
To filter a contact list, you typically need to begin by clicking a particular button or option in the software or application you are using. While the exact name of this button can vary based on the program, it's often labeled as 'Filter', 'Search', 'Sort', or similar. In some applications, such as a spreadsheet program, you might click on a funnel icon which represents filtering options. Once you click the appropriate button, you can then specify the criteria for filtering your contacts, such as name, location, company, etc.