Here are two simple, Jain-dharmic ways your phrase “Navkar Mantra lotus” is usually understood:

1. Navkar Mantra with lotus posture (padmāsan)

If you mean chanting Navkar Mantra while sitting in lotus:

Posture (Padmāsan / Ardha‑padmāsan)

• Sit on a clean, non-living cloth/asana.
• Cross the legs (half or full lotus as per your comfort).
• Spine straight, neck relaxed, eyes gently closed or softly downcast.
• Hands on knees or in dhyān‑mudrā (one palm over the other, thumbs lightly touching).

Chanting method (very simple)

• Slowly chant the Navkar Mantra with full respect (shraddhā) and attention to meaning:

Ṇamo Arihantāṇam Ṇamo Siddhāṇam Ṇamo Āyariyāṇam Ṇamo Uvajjhāyāṇam Ṇamo Loe Savva Sāhūṇam

• After finishing, sit silent for a minute and think:

“I also want to walk on this pure path of Arihant, Siddha, Āchārya, Upādhyāya, and Sādhu.”

This way is accepted in both Digambar and Shwetambar traditions; only minor pronunciation differences exist, not in meaning.

You can read more about the Navkar Mantra meaning and practice here

2. Navkar Mantra with lotus symbol/design

If you mean a picture or design where Navkar Mantra is written on or around a lotus:

• Lotus is often used simply as an auspicious, pure seat (padm) for holy symbols or mantras.
• In Jain context, the main holiness is in the Navkar Mantra itself, not in the drawing.
• Such designs can be respectfully placed in a clean, non-violent place and used only for bhakti, dhyān, and study, not for show or decoration near violence, TV, etc.

Essence: Whether you sit in lotus posture or use a lotus symbol, keep your bhāva (inner feeling) pure. The real power comes from Navkar Mantra and the virtues of Panch Parameṣṭhi, not from posture or art.