Can you amend your tax form while it’s in pending status?

[DoninGA]

Once a tax return has been filed it cannot be changed, canceled or retrieved

You will have to wait for the IRS to either Accept or Reject your filed federal tax return.
If the return is rejected you can make the necessary changes and e-file again.
If the return is accepted you will have to amend your original tax return. An amended return, Form 1040-X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 20 weeks or longer to process an amended tax return.

Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.

See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...

[xmasbaby0]

No.   You cannot make any changes to a return that has been e-filed but which is in pending waiting to be accepted or rejected.   If it is rejected, you can make changes and re-file.  If it is accepted, you wait for it to be fully processed and then you amend using a Form 1040 if there was a mistake or missing information.