Developer Cryo has released a handy tool for your PSP called the PRO Online Hotspot Selector.  The hotspot selector will allow you to easily edit the HOTSPOT.TXT as well as locate hotspots using the PRO CFW Online.  See below for a full quote from Cryo regarding the PRO Online Hotspot Selector tool for your CFW PSP.

Directions :

Digital Pad Up, Down: Move between options.
X: To elect or select our RED.
Square: Exit.

Quote from Cryo

"This useful application will easily solved by editing the file as HOTSPOT.TXT in which we must know the SSID of our network or router to work properly the PRO Online Client plugin, well many will say this can be done manually from our PC, so but thanks to this application will detect the available networks, or SSID in the place where you are, for example when you connect to various networks simply choose the appropriate SSID.

NOTE: Apparently has a bug with long names of the SSID, as this edit under the name of the Network and not the SSID, so if the SSID is longer than the name of the Network is not carried out correctly connection. This will not give you problems if the SSID name does not exceed 15 characters."

Source