Step 1: Go to your FB Ads Manager at HERE => Select your Ads Account
                    
                    Step 2: Right click on page and select View Page Source
                    
                        
                    Note: You may need to select your Ads Account first: Something like this
                    
                                     
                    Step 3: Press Cmd+F (Ctrl+F) to open find tool then input access_token  OR accessToken="
                    
                    Step 4: Get the Access Token (Click on image to see bigger size)
                    
                    * If you get errors like "Application does not have the capability to make this API call."
                    => Repeat Step 3 but get the second result => Ctrl+F then input access_token => press Enter twice or more.