To get started with multiplayer in PPSSPP: Quick-start guide.
Below is the detailed documentation for all the settings.
This corresponds to the physical WLAN switch on the real PSP. Just turn it on if you want to try multiplayer. However, if you're only going to play single player, it's recommended to turn this off - a few games like Obscure will enable networking if this is on, which disables save states.
This setting is currently only available on Windows. It will send information to a Discord client running on the same Windows session, showing it as "currently playing" if you are currently sharing your status.
You can change the MAC address of the emulated PSP here. However, it's not recommended to change it once you have set it - since some games will lock savegames to the specific address, invalidating them if you change it!
This setting doesn't really do anything meaningful, considering removing it.
This lets you select what server to use.
Relay mode is the new way of playing adhoc which is very easy to set up. See How to play for more information.
Lets you set the Nickname setting of the emulated PSP. This is what shows up as your username when playing in ad hoc mode.
This is used for local play on LAN or wifi. See How to play for more information.
This is the setup to use when playing on infrastructure revival servers.
This is your player name when playing on infrastructure servers.
Try to make it as unique as possible, as there's no global registry of these and no registration mechanism.
See Infrastructure servers for more information.
This is used when playing ad hoc in the old P2P (non-relay) mode.
Configure multiplayer chat here.
Leave at 10000. Both PPSSPP and aemu (software for modified PSPs) use a port offset of 10000 by default. If you want to try to connect to an unmodified PSP, this should be set to 0, but otherwise the default is best.
If you want to try connecting to a real PSP, use 0 here. Otherwise, unless you have a very specific an unusual use case, always leave this at the default of 10000. Players who want to play together need to have the same port offset for connections to succeed.
This lets you use fast-forward while connected. This frequencly leads to desyncs and disconnections so it's not recommended for use. There are a few games that are resilient to this though, like Phantasy Star Online.