From WordPress.org
- Go to Plugins → Add New Plugin.
- Search for Kayce Custom Archive Sections.
- Click Install Now, then Activate.
Upload the zip
- Download the plugin zip.
- Go to Plugins → Add New Plugin → Upload Plugin.
- Choose the zip, click Install Now, then Activate.
After activation an Archive Sections menu appears in your admin.
Uninstalling
Deleting the plugin from Plugins → Installed Plugins permanently deletes all archive sections and their settings. Deactivating keeps them.