See that thin, black seam to the right of the Asus ROG logo? That's the seam between the top cover and the bottom enclosure. Use a small flathead screwdriver or plastic spudger and gently pry the top cover up to release the retention tabs. Do this all the way around the seam.

Second image. The arrows indicate the connections that must be released before completely removing the top cover. Pull the tape off them and release the two with blue tabs by lifting the retention mechanism and then gently sliding the ribbon cable out. For the speaker cable, grasp the wires firmly near the plug and pull straight up.

Again, use care here. The ribbon cables can tear, so keep metal tools away from them.