Ready-to-Use Child Theme for the OceanWP WordPress theme.
Download the child theme zip file. Upload the zip (oceanwp-child-theme-master.zip) under your WordPress dashboard, Appearance > Themes. The other method would be to extract the files and upload them via FTP to /wp-content/themes/.
You can rename the zip file so it isn't called oceanwp-child-theme-master.zip. You can also change the "Theme Name" at the top of the style.css file, as well as the rest of information in the same file. This is called whitelabeling a child theme.