If you want to add your own organization tip for QTP instead of predefined tips which are displayed in QTP start up page, then go to C:\Program Files\Mercury Interactive\QuickTest Professional\dat and open the Tips text file. In this file you can add your organization or training centers tips.
For example: I want to instruct the user to save all your scripts in D: drive.
After adding the tip for the above instruction in the Tip file, you can see the tip as same as below in your QTP start up page,