Answer

In Jain Dharma, Mangal Path means an auspicious prayer or recitation done for spiritual well-being, peace, and removal of obstacles.

The most universal and accepted Mangal Path in Jainism is the Navkar Mantra:

णमो अरिहंताणं
णमो सिद्धाणं
णमो आयरियाणं
णमो उवज्झायाणं
णमो लोए सव्वसाहूणं

एसो पंच णमोक्कारो
सव्वपावप्पणासणो
मंगलाणं च सव्वेसिं
पढमं हवई मंगलं

What should I say?

You can say the Navkar Mantra respectfully and calmly:

Namo Arihantanam
Namo Siddhanam
Namo Ayariyanam
Namo Uvajjhayanam
Namo Loe Savva Sahunam

Eso Pancha Namokkaro
Savva Pavappanasano
Mangalanam Cha Savvesim
Padhamam Havai Mangalam

Meaning

“I bow to the Arihants, the Siddhas, the Acharyas, the Upadhyayas, and all Sadhus in the universe. This fivefold bow destroys all sins and is the first among all auspicious things.”

Takeaway

If you are asked to do Mangal Path, simply recite the Navkar Mantra with devotion, humility, and a peaceful mind.