Select Promotions
Create a new one or edit an existing one.
In case of needing more information to Create a Promotion:
​ http://help.rentlysoft.com/en/articles/5321393-how-to-create-promotions
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If the "Available for external systems" is selected, then that promotion will be shown at the web page. In the contrary, if is not selected, it won't shown at the web page.
The image you load, is the same that will appear at the web page. The same with the Name and Description

By clicking at the image, it will enable you to load an image from the computer.
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