Links

I’ve just started using WordPress and have it hosted at WebLog.co.nz coutesy of Mike at https://www.seriocomic.com/rhetoric/.
Have been trying to add a link back to my main site without success. I’ve added the link via Manage Links but cannot get it to work. <br>
The link is https://www.mcbridefamily.co.nz/index.htm but for some reason that I cannot see,it defaults to https://mcbridefamily.weblog.co.nz/wp-admin/www.mcbridefamily.co.nz/index.htm
https://mcbridefamily.weblog.co.nz is the address of the actual blog.
Ant suggestions for a real newbie?