How do you use DEXE hair color?

Could you please explain to me how exactly one should utilize the DEXE hair color? I'm curious about the steps involved in the application process. Is there a specific technique or order in which the product should be applied? Also, are there any special preparations or considerations that need to be taken before using the color? I'd like to know if there are any tips or tricks that could help me achieve a more satisfying result. Additionally, I'm wondering if there are any specific instructions for maintaining the color after application. Could you provide me with a detailed description of how to use DEXE hair color? Thank you for your assistance.