When you have located a Port Call from the Port Call list, click it and the details will show in a panel (so called "drawer") on the right hand side.
At the top of the drawer you can locate an action menu with several action options:
In the Port Call drawer, you can look through the different tabs below to display all the relevant information:
More detailed information in each of the tabs you can find under in the Port Calls section. Ex. "View Service Orders on Port Calls" for more information about Service Orders in each Port Call.
It is possible to change the instructed speed for each port call. This is a choice limited to the vessels speed and consumption combinations only depending on the leg being in ballast or laden.
The dropdown shows both the speed and consumption
Each speed will only affect the port call (leg) in question.
To add a speed for a vessel see the vessel documentation.