Set product messages in the "Before the selling period," "During the selling period," and "After the selling period" cards on a selling period rule.
Enter the message as follows.
(1) Open the selling period rule
From Shopify admin, go to Apps and open "RuffRuff Selling Periods." Open the target selling period rule.
(2) Enter the product message
In the "Product message" field on the "Before the selling period," "During the selling period," or "After the selling period" card, enter the text.
(3) Save
Select "Save" in the upper-right corner.
From the toolbar in the input field, you can set the following.
Text formatting: Bold, italic, underline, strikethrough, and text color
Link: The URL and whether it opens in the same window or a new window
Variables: Start date and time, and end date and time
To insert variables, see Display product message dynamically (variables).