Just paste your addon code and let us know where you pasted it the profile.php.
Either method is fine:
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1. Provide us with a unique search string where you placed your code.
2. If profile.php was previously unmodified, then provide us with the vbulletin version you are using and a line number where you placed the code.
If it is off a few lines, don't worry, we will figure it out.