how do i get that clip off on the brake pedle to change out the stop lightswitch

HAVE YOU CHECKED TO MAKE SURE THE BRAKE LIGHT SWITCH IS YOUR PROBLEM? IF BRK. LIGHTS ARE NOT WORKING IT COULD VERY WELL BE SIG. LIGHT SWITCH! JUST SUGGESTING OPTIONS. IF YOU CAN UNPLUG BRK. LIGHT SWITCH CONNECTOR AND JUMPER WIRES TO SEE IF LIGHTS NOW WORK, IF NOT IT IS MOST LIKELY SIG LIGHT SWITCH AS BRK. LIGHT CIRCUIT GOES THROUGH THAT SWITCH BEFOR GOING TO REAR LIGHTS. "ALL"FUSES OK? (ALL FUSES AS MANY AS YOU CAN FIND) JUST FIXED ONE LAST WEEK. SIG LIGHT SW ON "THAT"ONE. BUT YOURS MAY BE THE BRK SW. GOOD LUCK!