If you need to reset your saved your credentials to access the share folder from your PC you can delete those credentials by opening a command prompt running as administrator.
Then type the command:
rundll32.exe keymgr.dll, KRShowKeyMgr
You can then delete the stored credentials used to authenticate the share folder path on your local pc.
You can then try to access that share folder path and it should prompt you for the account user name and password again.