Login to WordPress admin use the following
You will be presented with a login screen as below;
Login using your admin username and password
You will be presented with a screen like the one below where many things can be set up and configured.
To change, add or delete coupons hover over the WooCommerce option in the left black menu, a sub menu will appear – select Coupons and the following will appear;
To create a new coupon select the ‘Add Coupon’ option in the top left of the screen;
Any existing coupons will be listed, if you click on the code then you can change the details of the coupon as follows;
On the left are useful option to restrict and limit usage of the coupons. The main options on this screen are fairly self explanatory.
When you have completed the changes remember to select the ‘Update’ button on the right to save the changes.