To remove an item from the Basket, click to select the check box in the Remove column for the product and click the Remove button at the bottom of the column. You can select more than one product for removal at a time.
You will see the Remove Product(s) from Basket screen displayed.

To remove the product(s) click on the Remove button. The item will be removed and the updated Basket screen re-displayed.
If you change your mind, click on the Cancel button. The Basket screen will re-displayed without changes.