Step 1: Go to Order Listing

Step 2: Click on the 3 dots and view the product

CASE 1: ACCEPT ORDER

Step1: Click  on the accept order button

Step 2: Clicking the "Accept Order" button, the seller can accept the fulfillment of an order

CASE 2: REJECT ORDER

Step 1: Click the Reject Order button 

Step 2: Click the Reject Order button and add a reason for order rejection,then hit the Reject Order button 

Step 3: To confirm the order rejection, see the below highlighted part