themes/corporate/config.yml at the top.
source/index.ejs
Create a folder in the source/ directory with the name of the page, then
create a file in that folder named index.ejs. Look at the other pages
(about, contact, etc.) for help. Don't forget to add the page to the
navigation menu (see above).
Use the command hexo new "POST NAME" (with quotes), and a file with that
name will be created in source/_posts/POST-NAME.md. Alternately, you could
just create the file yourself.
In general, I usually look in _config.yml or themes/corporate/_config.yml
for some sort of option related to what I want to change. If there's nothing
there, look in themes/corporate/layout/ for the .ejs file containing the
stuff you want to change. You can also look in themes/corporate/source/css/
to change the CSS. Don't be afraid to google stuff or ask on slack for help!