Need help installing. Keep getting server 500 error

Hi,

I am trying my best to work through this but finally am asking for help because I can’t figure it out. I am trying to install wordpress multi site onto my website brettfoxphotography.com because I want to have separate sites for the different sectors of my business with different content, but need to be able to manage them together.

I have installed wordpress on my host bluehost using their simple scripts.

I have gone into the wp-config file and added the necessary changes
I then go into wordpress and enable networking for subfolders (not subdomains)
I then go back into wp-config and add the code
Then I create a .htaccess file using text editor, transfer it over via FTP and delete the original.

This is my .htaccess codethat wordpress told me to add.

RewriteEngine On
RewriteBase /~brettfox/
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]

Then, when I go to my site, I get the internal 500 server error. Please help. I have tried this many times with clean installs and cannot figure it out to save my life. Please help.

Thanks