You can change the location of the database that now resides in "..\My Documents\My Payslip Database\" by editing the programs shortcut on your desktop. You can do the same for the shortcut in your start menu the same way.
Right click the "Timesaver:Calc for Tax 2013" shortcut on your desktop and select "Properties"
In the Target box, add a space after the existing Target and the new location of your database. For example: