Installing Word Press for new domain on same server

I host with network Solutions. I currently have one domain on there which is https://www.careerpathwaysonline.com It is programmed using WordPress.

I am adding a new domain https://www.technimediamarketing.com. I have made a new directory for it under htdocs. I am under the assumption that I have to do another install of WordPress under the new directory for https://www.technimediastudios. If so, how do I do that. I can’t get an answer from Network Solutions. I have reviewed there website, and talked with their techs from another country. They sent me a link to FTP instructions.

I don’t want to mess up my other WordPress installation for https://www.careerpathwaysonline.com

Can someone please advise.

Thank you

Frank