In the picture, look at the seat base #11. Left of center, there's a bolt holding it in. Squeeze between the seat base & back, find that & get a socket wrench on it.
Then you can slide the seat-base forward & unhook it. Been a long time, but maybe you'll have to tilt the seat up, kinda like hinging it at the front edge. Pretty similar for most Hondas, it was that way for my 95 Integra, 98 Accord, 03 Accord, etc.