You may create open houses at any time. There is no charge to create open houses. You must create open houses at least 48 hours before you want to hold them as they take longer to show up on websites.
Your Listings Dashboard is where you manage your listing after it is live.
Go to your Listings Dashboard by clicking here https://www.homelister.com/my-checklist.
On the left hand side select Open Houses. This will bring up a page where you may create and manage open houses.
Once you have saved your changes, you may close the website or navigate back to your My Listings Database.
Changes take up to 1 business day to reflect in the MLS (Multiple Listing Service). Open houses are the slowest thing for Zillow and Realtor.com to update and they will often take a full day to show up.