Deleting iCloud account with no password entered on the iCloud page

The password for my iCloud account has not been entered on the iCloud page under settings and I don't know what it is and therefore because it's not already entered on the iCloud page I am not able to follow the instructions to turn off

Find my iPhone without the password. I need to turn off Find my iPhone in order to delete my iCloud account.

iPhone 5 and iOS is 8.0.2.

Any suggestions what I should do?