APA 6th EDITION (see left column) or APA 7th EDITION (see right column)
It may be difficult to position the page number and the running head on the first page and then format them differently on subsequent pages.
Watch all or part of this 18-minute YouTube video which explains how to set the format in Word using Windows. Here are the time segments in case you want to skip around the tutorial:
Source: Samuel Forlenza, published January 6, 2018 on YouTube.com
Tutorial by Terrance D. Jorgensen, Kennesaw State University, Kennesaw, GA demonstrating how to type a paper using APA format on a Mac computer.
This is a 10-min. video.
How to Format Papers in APA (7th edition) tutorial by Kayleigh, an online writing coach at the Online Writing Center at snhu.edu
Click on the Show More link below the notation "Skip ahead to the parts you need" to show the time sequence for each section.
This is a 14-minute video.
Tutorial for APA Style, 7th edition: Student Paper Formatting by Samuel Forlenza, PhD on January 21, 2020.
Click on the Show More link to designate the time sequence for each section.
This video is 17 minutes.