Dashboard of Sub-domain

Hello All,

Perhaps someone out there can assist.

I have the multi-site network set up on my site. I can access the dashboard and site of the main site without a problem.
In the sub-domain – when I click to view the site – I have a blank Bluehost page. No error. That is, the page exists, but doesn’t have my WordPress theme.
When I click to view the dashboard of the sub-domain, or to edit it, I get a 404 Bluehost Error message.

The code in my .htaccess is:

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]

I am not sure I did all that is included in the following instructions:

Multisite requires mod_rewrite to be loaded on the Apache server, support for it in .htaccess files, and Options FollowSymLinks either already enabled or at least not permanently disabled. If you have access to the server configuration, then you could use a Directory section instead of a .htaccess file. Also make sure that your httpd.conf file is set for “AllowOverride” to be “All” or “Options All” for the vhost of the domain. You can ask your webhost for more information on any of this.

I don’t understand exactly how to do this. Can someone explain it a little simpler?

Thank you so much!