Hello, Sadikul Islam,
In order to modify the word “From: “, you must change it in the Theme language files. You can use the Loco Translate plugin for this purpose. Please refer to the screenshots provided at the following links: https://postimg.cc/21g4sJ5f & https://postimg.cc/mtDCtRzs.
Additionally, please refer to our theme documentation for the Loco Translate plugin here: https://www.8theme.com/documentation/xstore/theme-translation/base-theme-translation/.
Best Regards,
8Theme’s Team