Rear ones you open the doors, then slide them forward towards the door, then pull away, might leave some clips on the car though so be sure to take them off too (turn them sideways and pull out, the attatch back onto the side strip as it makes it easier to put them back on)
The front ones have a small torx screw that need to be undone, you get to it by removing a little black grommet/popper type thing. Its on the end of the door on he inside, should be fairly obvious if you look where the strip ends and look behind it. Just cant remember if its at the front or back of the strip, make sure you dont drop the screw into the door frame too though as its abit fiddly. (Im not the best at explaining but it is very easy to do)