If turbo tax limits me to five characters spaces for my pin number, will not accept a sixth number, how do I add the sixth space?

You are confusing the five and six digit pin.  Here are directions for your six digit pin

 

https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/add-remove-6-digit-ip-pin/L1cz7f2zQ_US_en_US

Yes, there are two separate PIN numbers that may be on your tax return. If your PIN has six digits, it's an IP PIN. Here's where to enter it:

 

 

 

1. Sign in to TurboTax Online.
2. Select Other Tax Situations. 
3. Select Start or Update to the right of Identity Protection PIN.
4. Answer the first question Yes.
5. Select  Add to the right of your name.
6. Enter the number on the next screen. 
7. Continue your tax return.

 

 

What if I am using TurboTax on my personal computer how do I update the PIN to accept 6 characters? 

If you have a 6 digit PIN issued to you by the IRS you need to enter it in order to e-file.  Go to Federal>Other Tax Situations>Other Return Info>Identity Protection PIN and enter the six-digit PIN.