OK, I assume that you received a 1099-R for the withdrawal, that you entered it, and now you want to delete it, right?
Go to Wages & Income->Retirement Plans and Social Security->IRA, 401(k), Pension Plan Withdrawals and click Update (or whatever the button to the right says).
The next screen should show you a list of previous entries that you had made. On the right you should be able to click on Delete or something similar to remove that 1099-R entry.
Note that these instructions are from the desktop version of the product; the online version might differ. Come back if you can't make this happen.
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