Read more about the grid's "base functionality" here.
Opening a Cargo
By clicking the -icon in the left-most column, you will be able to open up the Cargo drawer for that specific row. From the below view, you can edit the selected cargo:
Cargo drawer from Cargoes grid view
Changes done in the drawer will be reflected in the rows.
Additionally, you can also use all the primary (and secondary ) actions as usual: