How to add html to wordpress?

Hi all,

I’m struggling about how to get the weather-display html output to my wordpress-domain.
Can anyone help me?

my ftp folder structure:

cgi-bin
STRATO-apps
(i add manually public_html and set weather display to upload to that folder, but every time i get an 404-error)

https://www.wateenweer.com

Greetings,
Ruud

Is WordPress installed in public_html? If not then maybe your webroot directory isn’t public_html?