When you amend your filing status, you will need to change the way you answered certain questions in My Info. What are you trying to change it to? Has your original return been fully processed yet? If not, wait until the return has been fully processed, and then you can amend if necessary. An amended return on which you have changed your filing status will have to be filed by mail.
https://ttlc.intuit.com/community/tax-return/help/how-do-i-amend-my-2021-return/00/2544441
Even during “normal” times it takes about four months for the IRS to process an amended return. During the pandemic and due to the severe backlog at the IRS it is taking much longer—six months or more for many amended returns. Do not expect quick results from amending. When the IRS issues a refund for an amended return it will be by check. They do not make direct deposits for refunds for amended returns. You can watch for information here:
https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1
If the filing status on your original tax return is married filing jointly you cannot change it on an amended return after the filing deadline, which has already passed. If that is what you are trying to do, post more details and we'll tell you what, if anything, you can do.