1) Launch to EasyWork Hub --> Navigating to sidebar menu and search for "Procurement " --> Click "Purchase Order". It launches on the Purchase Order page. 

2) To edit, click on the pencil icon after that.

[Only PO in status "Draft" and "Pending" is allowed to modify. For those that cannot edit, the pencil icon would be disabled and greyed out]

3) It will prompt an edit purchase order form. Make the changes as desired.

4) Remember to save the changes. Your purchase order has been updated successfully.