You cannot change banking information while your return is in pending, nor can you change it after the return is accepted. The IRS does not allow it.
If you e-filed:
Banking information for direct deposit is wrong or closed
If you entered incorrect banking information for your refund, you can change it if your return is rejected. If it is accepted, however, it is too late to change it. The bank will reject the refund and send it back to the IRS. Then the IRS will issue a paper check and mail it to the address you put on your tax return. Expect a delay of at least a couple of weeks to receive your refund.
Here is what the IRS says about entering incorrect banking information
if you requested direct deposit it should occur in 2 to 3 weeks after being fully processed. note Turbotax receives no info about refunds once the return is accepted if no direct deposit was elected maybe 4 - 6 weeks after the return is fully processed. if direct deposit is elected but invalid routing or account number 8 weeks or longer because the deposit has to go back to the iRS to issue a paper check sent to the address on the return. these are at best estimates.