HOW DO I KNOW HOW MANY SPACES TO SEPERATE NUMBERS AND SUCH IN BLOCK D

Are you asking about Box D of your W-2?

It is a combination of letters and numbers.  There is usually one space in between two sets of letters and numbers.

Box 😧 This is a control number that identifies your unique Form W-2 document in your employer's records. This number is assigned by the company's payroll processing software.

Box D Control Number is a code that uniquely identifies your unique W-2 document in your employer's records. This number is assigned by the company's payroll processing software, and is only needed if attempting to electronically import your W-2 into a tax software program (like TurboTax).  Please note that not all W-2s (or employers) will necessarily include or support a Box D Control number. 

The actual Control Number itself, is not necessary in completing your tax return.

If you choose to type in your W-2 manually, rather than importing it electronically, then you should not have to enter anything from Box D at all, if you do not want to.  In fact, you can simply leave the field blank.  The exceptions to that would be if you are attempting to e-file your return and see some sort of W-2 Control Number related error.