RewriteEngine on
RewriteCond %{HTTP_HOST} ^https://mx-blind.com
RewriteRule ^(.*)$ https://mx-blind.com/vb/$1 [R=permanent,L]

RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^blog.mx-blind\.com$ [NC]
RewriteRule ^(.*)$ https://mx-blind.com/$1 [R=301,L]