When you deploy OVA, you could choose 'permit root logon' to true. Then you could ssh to VIO Manager using ssh.
Account is locked for 30 minutes with too many attempts of wrong password. You could try login after 30 minutes.
Once login, use 'kubectl get pods -A' to check Pods' status which could be the cause of UI not accessible. Use 'viocli get deployment' to check which state your deployment was in. For details, refer to controller Pods' logs.
The resource used by VIO is the OVA deployed and controller VMs created in the resource pool specified during deployment. You could safely delete them from vCenter and start over.