htaccess editing for changing wp-admin url

i am trying to change "wp-admin" url to "dashboard"
exactly
subdomain.domain.com/wp-admin to
subdomain.domain.com/dashboard

here is my .htaccess file
grabbed code from here

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

##### ABOVE THIS POINT IS ALREADY INSERTED BY WORD PRESS
##### Michi’s code is BELOW #####
RewriteCond %{REQUEST_URI} wp-admin/
RewriteCond %{QUERY_STRING} !mycdashboard
RewriteRule .*\.php [F,L]
RewriteCond %{QUERY_STRING} !mycdashboard
RewriteRule ^dashboard/(.*)
wp-admin/$1?%{QUERY_STRING}&mycdashboard [L]
##### Michi’s code is ABOVE #####
##### BELOW THIS POINT IS ALREADY INSERTED BY WORD PRESS