Yoga Lakshmi Narasimha is a manifestation of Bhagvan Srihari Vishnu. The most important prayer dedicated to the deity is the Yoga Lakshmi Narasimha Suprabatham. You can download the prayer in Telugu text in pdf in the link given below.
The prayer should be chanted during morning or evening hours.
It is also chanted on auspicious days dedicated to Narasimha especially the appearance day of Narasimha Jayanti.