Copy the code and past in .htaccess file and change the ip with you.
RewriteCond %{REQUEST_URI} ^/(index.php/)?admin/ [NC] RewriteCond %{REMOTE_ADDR} !^196.196.196.196 RewriteRule ^(.*)$ http://%{HTTP_HOST}/ [R=302,L]
Example:
RewriteCond %{REQUEST_URI} ^/(index.php/)?youradminname/ [NC] RewriteCond %{REMOTE_ADDR} !^ change here is your ip(196.196.196.196) RewriteRule ^(.*)$ http://%{HTTP_HOST}/ [R=302,L]