In the older versions of PSP you could find the "Manual Colour Correction" command under View ---> Colour balance. That option is still there in the newer versions of PSP, it's only hidden. If you'd like to put it back go to:
View ---> Adjust
In the Commands tab scroll down to the bottom and click on All commands and try to find the Manual Colour Correction command on the right side.
Drag the command to the menu where you would like to have the command. In this case you can drag it to the menu Adjust and put it right under Colour balance.
Here is an image overview from the layouts I have created. If you
would like to use one of these layouts, please go to my page Nolver's Theme Designs.
All the details on how to install the theme and the CSS codes can be
found there. Nice comments are always appreciated ;-) All my layouts are
viewable with all web browsers.