Every 2 week pay period, I had them withhold an extra $75 so that would be a total of 1,950.00 that I paid in that is not accounted for. Where do i enter that?

If the extra $75 was withheld from your paychecks, then it should be accounted for on your W-2 in box 2.  If it is not included in box 2, then you should contact your employer for a corrected W-2.

There is a place within TurboTax to report other withholding amounts not reported elsewhere within your return.  However, it is not meant to be used when the withholding should have been included as part of your W-2.

Use the following steps to go to that section:

• On the top row of the TurboTax online screen, click on Search (or for CD/downloaded TurboTax locate the search box in the upper right corner) 
• This opens a box where you can type in “other withholding” (be sure to enter exactly as shown here) and click the magnifying glass (or for CD/downloaded TurboTax, click Find)
• The search results will give you an option to “Jump to other withholding”
• Click on the blue “Jump to other withholding” link and enter your information