Ok. thank you for all your comments. Now i followed the instructions and created a new startorb using photoshop. The instruction says that 'Switch to the Brush tool, set it to something decent like 100px at least, hardness doesn't matter here, and fill in as much as your can of your selection with white. Notice how the selection we made earlier follows the 'glow' effect of the orbs and only allows a certain amount of white to be 'painted' onto the Alpha channel? That's what gives the soft edges on your Start Orb later.'
Here the problem comes. I'm having a hard time using brush painting the alpha channel white. Due to the glow effects, it is difficult to paint only the certain amount white.
Anyone here has any good ideas to solve this problem?
I'll upload my startorb bmp with alpha channel untouched. If you can, please help me to paint it white. I'll appreciate it.