Form 8453 is simply a transmittal form that you file only if you are attaching a particular form or supporting document. It does not require a signature and is used in only rare circumstances. It's hard to tell what your question is without knowing more about your situation. If you have additional questions or details regarding this, please feel free to post in the comments for further clarification.
Note: You can submit only the specified forms or supporting documents listed on Form 8453 using the form. Review Form 8453 and the instructions for which items can be attached.
TurboTax will instruct you when the form is necessary. Again, any additional details will help in answering your question.
Mail Form 8453 along with the paper document attachments to:
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
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