Once your tax return is filed and accepted, you can't change the way to get your refund. Accepted is just the first step in the IRS process. Your return must be totally processed and approved before the refund will be sent.
You can track the status at the IRS tracking web site: https://www.irs.gov/refunds
Here are Q&As about the process: https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions
