How can I contact an advertiser through the app? 19 November 2018 16:51 Updated When viewing the details of an ad, simply press the blue "Call" or "Write" button to communicate with the advertiser. For more details about messaging, please click here. Related articles How can I contact an advertiser? How can I reply to a message? How do I know if I received a new message? How can I share my ad with others? What can I do if the package I purchased doesn't appear on my iPhone or iPad?