Gently pull the circuit board away from the front faceplate.
Be careful not to tug the wire connecting the circuit board to the speaker, as it is still attached to the faceplate.
Do not touch the the button contacts on the circuit board (the button contacts are shown in the red box of the second picture). This can cause long-term damage to the radio unless you properly clean them (see Repairing Motorola TALKABOUT FV700 Two Way Radio Button Contacts Guide).
Now the circuit board can be removed from the back faceplate.
To do this, grip the back faceplate in one hand and the antenna in the other. Pull and twist the antenna away from the back faceplate. The circuit board should be removed with the antenna, as they are attached.
Observe the orientation of the speaker as it is removed, so that the new speaker can be installed to face the same way as the old one that you are removing.
You should end up with just the circuit board and speaker, as seen in the picture.