Adding wordpress to my site

Do you have a host? If not take a look at these https://www.ads-software.com/hosting/ There will be a fee of about $6 a month, maybe more.

Some will have an one click install. You fill out basic details such as sign in name and password then click install and you are good to go.

To install it manually you can download here https://www.ads-software.com/download/

So the wordpress itself is free but hosting cost dollars.

If you want a free wordpress site without paying a hosting fee you can set that up at https://www.wordpress.com