1) Install the WP-Insert plugin (or update to the latest version if you already use it). Please, see the installation instruction here: https://wordpress.org/plugins/wp-insert/#installation 

2) Go to the WP-Insert Settings menu, press "Log In" button and enter your vi credentials.

3) Press "Configure vi Code" button (which will appear after logging in) and follow the instructions.

4) In the WP-Insert Settings menu click "Ad - Above Post Content" or "Ad - Middle of Post Content", select "vi Stories" and press "Update" button.