Can someone help me with a video on how to make the change? i have the new Butt Pad but i don´t understand how to remove the old one.

thanks in advance

The buttpad is not actually intended as a wearing part and therefore, as far as I know, cannot be separated from the stock in a non-destructive manner. I am also not aware of any specialists who offer this service, This may be the reason why there are no videos about it.
If there are clips on the butt plate, you can probably mill the cap out. Otherwise, I would leave it alone, contact SIGSauer in Neuhausen Switzerland. In any case, you should not try to lever it out.

Well, my gunsmith does this job and he let fabricate these pads. They are cheaper than the origina