Well they really didnt say on how to download it and how to install it so i had to google it -_-
Its just like the google chrome on your computer except you can listen to music while your searching around the internet....
So you just put the pspchrome folder into the root of your psp...
Then
go to the internet browser on your psp then put
file:/pspchrome/index.html into the address on the top of your screen
then it will bring you to a screen that wil have some flags that say
your language... then it will bring you to psp chrome and evertime you
click on the internet browser it should bring you to chrome....
Link: Psp Chrome V1.0