There are 2 types of salary change.

1. Without designation change
2. With a change in designation

Without designation change

Go to the staff profile and and a new salary history.

Fill in the required details especially the effective date and you are set.

With a change in designation

Go to the staff current employment section and edit.

Fill in the new designation, set new effective date of the new designation, and set new salary and effective date of the staff's new salary.

IMPORTANT!  Click on Create New Record.