You need to know how to open the console first: You do this by holding shift andpressing tilde (the key next to 1 and below escape). On my keyboard it gives either ` or ¬
From there you need similar but slightly different commands.
General - In the console type: bind <key> <command>
for MP taunts you need: bind <key> +taunt
for SP taunts you need: bind <key> taunt
and bind <key> victory
Take careful note of the "+" before the MP one, it's very important. There is no "victory" equivalent in MP (AFAIK anyway)