First of all, do you have a homebrew enabled(modded, hacked) PSP near you? For example: A friend, a family member, or someone you know that has a homebrew enabled PSP.
Then, with the help of that PSP, you can create something called the Pandora's Battery. It turns your battery into a battery you can use to mod your PSP.
If you don't understand, or just need more help, you can send me a private message. :)
Good luck.