From your loads page, click on the load you want to edit/delete, and you will arrive on the load details page:

From here, you can click directly on any of the details you want to edit. Ex: to change the customer, click on the customer's name (F.A.K. logistics in the example above).

You can now fully change the customer by clicking into the field with the magnifying glass, or use the pencil icon to change the customer's details. Then hit Save to save your changes. You can edit any other information in the load in this same way, click on the information itself, change it, and hit save.

To add a new attachment to a load or delete a load, click on the 3 dots at the top right corner of the load details window, right next to the Share button. From here, you can choose to Attach a File, or Delete the Load.