Jake here from the Shopify guru team :)
An easy way to add a visible banner to the top of the page with text would be to use a service like https://www.hellobar.com/ ;
Otherwise, you could create an image with that information on it and upload it to your slider in your Theme Editor. You can use a image editor like https://pixlr.com/ to create that kind image if you don't already have a software to use for that.
If you're looking for something a bit fancier you could look at hiring one of the Small Job Experts for this kind of thing. You can reach them here or by using the Find an Expert function in your admin's profile menu.
Hope that helps!
You're right, it's not in the app store. You can still use it from their website though if you'd like to. If you're looking for something from our Apps Store rather than offsite you could check out Welcome Bar by Apptuse :)
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