Hello Guys,
Nguyen asked me "how to change the font size in watermark" and decided to share the solution for all,
probably it would be helpful for someone.

1. Open the file: /includes/classes/rlResize.class.php
2. Find the code (line ~230):
Code:
Only registered members can view the code.
and change the 6.5 to 10
3. Find the code
Code:
Only registered members can view the code.
and change 2 to 7 (this is the font size number)
then bigger font number you set here then bigger value you should set in the previous code line.

John