InfoPath Dev

I need to have my form done by the end of today, and for security the approve button on the form must be hidden unless it is a specific person in the organisation who opens the form. How would i set up a formatting rule on this button to say if not this person then hide this control ? thanks

For example (other variants are possible) , set a formatting rule on your approve button in Infopath Designer:

• Home tab on ribbon > Manage Rules > New > Formatting > Hide this control (and/or Disable this control) with "Condition:" there that user is not that specific one
  

How you work with and manage users depends (is it filler or browser form,  2007 or 2010)

You can prefer to use  sharepoint built-in UserProfileService.asmx web service or other methods

userName() will give you local logged-in username on client machine operating system and sharepoint accountname username from browser

You can create a helper datafield (without control) setting there username for creating a condition in the rule

I enclosed athe template demonstrating it (for a local username Administrator). Probably to fit with a situation of a form in browser, you simply can add "Or"-check in condition

thanks for your answer :)