I have being trying to create my URL link,but it showing me,the blog address is invalid or not suppo

Hello Zainab Bukar maijalo,

 

When you first set up your blog, you must select a subdomain that will be part of the blog's identity on the "blogsot.com" domain.

Once you do that, you can put the blog on a custom domain such as "thedailypost.com," if that domain is available. But you must have a blogspot.com subdomain first, and you cannot specify the custom domain at setup.

See https://too-clever-by-half.blogspot.com/2020/03/your-free-blogger-web-address-url.html