Reset Password
Step 1: Request for password change at https://developers.onemap.sg/resetpassword
Step 2: You will receive an email to your account. Check your junk or spam folder if it is not in your inbox.
Step 3: Copy the confirmation code from the email to complete your password reset at https://developers.onemap.sg/setpassword
Step 4: After setting your password, an access token will be generated for you. The token will expire in 3 days. You can also retrieve the access token through the authentication service listed at https://developers.onemap.sg/#authentication-service-post
Hope this resolved your reset password woes! 
PS. There is a topic on Access Token retrieval at Steps for API Authentication
Have a great day!