Some WordPress plugin support inserting JavaScript or CSS to header or footer of your website.

Here's how to do it.

i. Navigate [Plugins] --> [Add New]

ii. Search and Install the plugin. Then activate it.

iii. Navigate to [Global] tab

iv. Paste copied script to text area of [HTML (end of the body tag)]

v. Then click [Save Changes]

All clear, generate an artiafct to apply the code to static site.

i. Navigate [Plugins] --> [Add New]

ii. Search and Install the plugin, then activate it.

iii. Click [Add new]
iv. Choose [Site Wide] from Site Display
v. Choose [Header] or [Footer] from Location
vi. Paste JavaScript or CSS to Snippet/Code area.
vii. Click [Save] button

All clear, generate an artiafct to apply the code to static site.