In order to get notifications when the Work Order Steps change, you must first get to the "Administration" dashboard:
Then, scroll down to the lower part of the page and click on "Work Order Steps".
Afterwards, edit a step to assign notifications to it (you can also assign notifications when creating new Work Order Steps)
While editing the step, select the email template shown in the image below
Select the user or users that you want the email to reach (notice that technician-type users will not receive a notification if the work order whose step changed is not assigned to them)
Then, when you change a work order's step to that one, you will receive an email notifying it.
Then, scroll down to the lower part of the page and click on "Work Order Steps".
Afterwards, edit a step to assign notifications to it (you can also assign notifications when creating new Work Order Steps)
While editing the step, select the email template shown in the image below
Select the user or users that you want the email to reach (notice that technician-type users will not receive a notification if the work order whose step changed is not assigned to them)
Then, when you change a work order's step to that one, you will receive an email notifying it.