Hello I ve already tried as suggested in the FAQ https://easy-appointments.com/faq/#emails-are-sent-from-wordpress but don't seem to find the right field to set it up

Hi, it is in that second tab (Mail notifications). Second from the top. There you will find that option. Best regards, Nikola

Ive did change the Send from the last option to my email but still says Wordpress

Hi Joe, you need to do that in a form of
Some name <mail@example.com>

Best regards,
Nikola