On the day before Ekadashi, known as Dashami, eat only one meal before sunset, and avoid onion, garlic, and other tamasic foods.
On Ekadashi, wake up early, bathe, wear clean clothes, offer water, flowers, incense, lamp, and fruits to Lord Vishnu and Lord Krishna, and recite Vishnu Sahasranama.
Fast by consuming only fruits, milk, and water. Avoid impure foods, and abstain from sinful activities.
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Spend the day in meditation, reading, and listening to the Bhagavad Gita. You can also visit a temple of Vishnu or Krishna.