Log in to the Jolt web app and navigate to labeling > label templates.
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Make sure you are on the templates tab, then click on the green new template button.
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A modal window will appear. Name your template, select one of the day of week options from the starter template section, and click create.
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Customize the template and fill out the required fields. You can also click the plus sign within the template to add more rows.

Once you are done customizing the template, click save.

Go to the labels tab to create labels for this template.

Log in to the Jolt mobile app and navigate to labels and make sure you have a printer connected.
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Select the printer used with day of week labels, and change label orientation to inverted.

When printed, the label will black out all days except the expiration day.