Delivery execution is done per delivery line on a Delivery form. You need to open the Delivery form and then select the delivery line in the Delivery lines section to see delivery information. A series of tabs allows you to enter different types of information about the delivery, but the Execution tab is where information about the Delivery execution is entered.
Exactly what needs to be entered to execute a delivery depends on how certain logistic events are configured, but in general a B/L date and B/L number are often entered here along with more information about what quantities of goods are actually being delivered.
See the Execution Tab section for more instructions on how to enter information in this tab.