Answer

If you mean Moksh Dandak Tap / Moksh Doda Tap, it is a Jain tapa (austerity). I could not verify one single, universal public vidhi for it, so the safest way is to do it only under the guidance of your local sadhu, sadhvi, or sangh. In Jainism, tapas is part of the moksha-marg, along with samyag darshan, samyag gyan, and samyak charitra. ( jinavachan.blogspot.com)

Explanation

A simple and respectful way to approach it is:

• Take a clear sankalp: decide the tapa with humility, not pride.
• Get the exact vidhi from your guru or sangh, because tapasyas can differ by tradition.
• Observe the prescribed restraint exactly: fasting, rules about food, water, and daily conduct as instructed.
• Keep the mind pure: do pratikraman, swadhyaya, japa, and contemplation.
• Avoid display: in Jain Dharma, the purpose of tapa is karmic purification, not show.
• Complete it properly with parna/udhyapan exactly as your tradition prescribes.

Jain sources describe moksha as liberation from karmic bondage, and the Jain path as right faith, right knowledge, right conduct, and tapas. ( jainworld.jainworld.com)

Spiritual Understanding

In Jain Dharma, the real value of any tapa is:

• nirjara: shedding karma
• vinay: humility
• sanyam: self-restraint
• shuddhi: inner purification

So the outer discipline matters, but the inner bhav matters even more. A tapa becomes spiritually fruitful when it is done with faith, restraint, compassion, and detachment. ( jainworld.jainworld.com)

Takeaway

If you want to do Moksh Dandak Tap, do not improvise it on your own. Take the exact vidhi from a Jain guru or your sangh, and keep your focus on bhav, restraint, and karma-nirjara. ( jinavachan.blogspot.com)