How to customize the shop message?
To customize your shop menu message, go to the Shop tab in your community dashboard, select one of your shops in the Shops tab, and switch to the Customization tab at the top.
Shop customization tab
If the message in your Discord server didn’t update automatically, you can refresh it manually by going
into 
⚙️ settings > 🛍️ shop > 🛒 shops > [your shop]
in your admin control panel
and clicking the refresh menu button.
Shop message settings in the control panel