The email address is ConsKtm@state.gov

Address it to the consulate officer. Tell them when you are going to Nepal and how you would like to set up an appointment for visa interview. Do not forget to mention that your status is H1B and you want to stamp it.
They should then ask you which day you wanna come and drop the documents. Tell them when and they will give you an interview date the very next day if not the same day.
I don't know anything about the PIMS though.