US embassy Nepal ko website ma nonimmigrant visa section ma clearly lekheko chha k k garne.
1. Nepal Investment Bank ma gayera fee pay garne and code number line
2. Ustraveldocs.com/np ma gayera ds-160 online bharne ani interview date select garne
3. Form bhareko confirmation print garera interview dina jane given date ma.
Other documents ma just passport and passport photos.
These days US embassy nepal doesn't allow to bring financial documents and invitation letter. The visa will be granted solely based on the interview.