Instructions:
http://codex.wordpress.org/Create_A_Network
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I didn’t read this, but probably should:
http://codex.wordpress.org/Before_You_Create_A_Network
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Activate plugins on singles:
Go to network admin. Install a plugin. Do not activate it.
Go to a sub site. See the newly installed plugin in the list. Activate it.
Yes, it’s a bit more of a run around if you just want to fiddle with a plugin or two on one site.
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Plugin, Probably won’t use:
http://wordpress.org/extend/plugins/network-latest-posts/
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The .htaccess file
http://wordpress.org/support/topic/need-hosting-advice
should look like this:
#BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
- uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]
- add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $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]
#END WordPress