You DID follow the instructions on the OTP page..
Keep below OTP key offline at safe place to prevent from loss. Miningpoolhub does not permit you to disable OTP except OTP verification code because of account hijacking attempts. (e.g. Email or passport verification can't disable OTP)
OTP key : KOFMUOOXK2Z4SN,,,,,,,,Install authenticator on another device and enter the OTP key....