have login page but could not log in…

You get an error page. So what does the error say?

After I put in my user name and password, it directed me to the page”https://butterflybutterfly.info/wordpress/wp-login.php”
It said:
Error 404: NOT FOUND!
Your browser cannot find the document corresponding to the URL you typed in.

Thanks for your help!

Are you sure about the directory? I go here:

https://butterflybutterfly.info/wordpress/

And get a 404 as well, which tells me (as far as the server is concerned) there’s no wordpress/ directory there, etc. And your member url you set up with is:

https://butterflybutterfly.info/blog/

where there appears to be a copy of WordPress staring at us.

If you have access to your database through a tool like PHPMyAdmin, you can check and correct the url you set for the WordPress address (site_url), which appears to be the problem here:

https://www.tamba2.org.uk/wordpress/site-url/