Can someone please help me set up for online play for the psp emulator?
Kinda falls outside our expertise. That's not modding at all so much as just finding a way to do a local connection over the internet with an emulator.
You'd do better to look for communities dedicated to this. I know of one on Reddit - https://www.reddit.com/r/finalfantasytactics/comments/9ox62w/online_multiplayer_community_info_in_comments/?utm_medium=android_app&utm_source=share