You can invoke the Goddess by following some of the remedies mentioned below:
1. Offer shringar to the Goddess on every Durgashtami or Saturday.
2. Chant mantras :
“Om Aim Hreem Kleem Chamundaye Vicchaye”
“Om Jayanti Mangala Kali Bhadra Kali Kapalini Durga Kshama Shivadhatri Swaha Swadha Namostute”
3. You should visit temple and perform puja.
