need some help with thread tools

[FatalBreeze]

Hello!

I have added the thread tools this option:

<div><label for="ao_mch"><input type="radio" name="do" id="ao_mch" value="makechallenge" /><if condition="$show[make_challenge]">$vbphrase[challenge_delete_challenge]<else />$vbphrase[challenge_make_challenge]</if></label></div>

Now, when i click it, of course i get this error:

Invalid Action Specified

What i want to know is, what file or hook do i need to edit in order to really change the thread status and now get this error?