I would like to set up a discount coupon/code for example CHRISTMAS24 which will give the customer 24% discount. How can I do this?

In the left side menu choose "Codes" under "Manage" choose "Discount" and then click on the button "+New Codes" and a pop-up will open. 

In the pop up under "Content" search for courses and then add one or several courses on which the customer can use the coupon, under discount you can fill in the "Discount" percentage.

 You can also limit the amount of coupons under "Usage limit" give and add a name/text for the coupon for example "CHRISTMAS24"
Furthermore you can limit the validity period for your coupon by adding a time period.

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