For general information on how to set up a campaign follow the steps linked to Campaigns
Set the campaign Status to Promotion.
Log into Holiday Manager > Website Content > Pages.
Either add a new content page, or include the following insert on an existing page. [site-campaigns?mode=promotion]
View the page on the website to see code field and submit button.
Supply the party with the direct link to the page and also the promotional campaign ID so that they can take advantage of the offer.