Wordpres Templates
first of all make sure that the templates for just made for Wordpress (WP) , and after that upload your files to worpress via ftp client Like FileZilla,
first open filezilla and fill up your host, user name andd password,
then go to your WP folder (ex: - /public_html/blog),
than go to wp-content,
and then go to themes,
there you can upload your themes, make sure it is not zipped and every file is inside a single folder,
after that go to your WP-ADMIN and select the theme you want to make it as default,
that's all.