To apply for a Mongolia eVisa, applicants should first visit the official Mongolia eVisa portal and check eligibility based on their nationality and travel purpose. Fill out the online application form with accurate personal, passport, and travel details. Upload required documents such as a valid passport, recent photograph, and travel itinerary. Pay the visa fee through the available online payment methods. After submission, applicants can track the status of their application online. Once approved, the eVisa is sent via email and must be printed for travel. Ensure all information is correct to avoid delays or rejection during processing.