We get a lot of support tickets because subsites are not setup correctly, so the goal here is to make everything simple. The first step is to add the new domain to the domains list in the User Portal. If you’re using a subdomain, and plan to use several more, our support staff can enable domain wildcarding for your account, which will prevent the need to add each subdomain to the domains list.
Navigate to “All Sites”. The URL is /wp-admin/network/sites.php
Note: For example purposes, your website is domain.com
Click “Add New” at the top. It’s next to a key-looking icon.
Image may be NSFW.
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You’ll be taken to this screen. Now, notice that there is *only* one important field to fill out. Choose one word. Do *not* choose something like www.domain.com, because then it becomes www.domain.com.domain.com. This is a constant thing with end-users, and the logic behind this is as follow:
Your primary domain is domain.com – When you create a sub-site, it becomes subsite.domain.com – The goal is “map” subsite.domain.com to actual domain that you’re going to use, such as subsite.com – That’s it. What makes things complicated is when users try to put a full address, instead of one word in the field.
Actually, WordPress won’t allow you to use something other than one word. You’ll get this screen:
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Okay, this is where users seem to complicate things.
Once you get to the screen below, do NOT change any values. None. You’re done.
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Next to use the domain mapping plugin to essentially “map” test.domain.wpengine.com to whatever domain you want (in this case, test.com). You can find the plugin here:
http://wordpress.org/extend/plugins/wordpress-mu-domain-mapping/
Keep in mind that you need to “Network Activate” the plugin, so that it’s available for all sites
Once that’s all setup, navigate to the Domains page. Here is the URL associated with it:
/wp-admin/network/settings.php?page=dm_domains_admin
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You’ll be filling out the bottom part. First you’ll need to find the Site ID for the site we just created. If you go back to the “All Sites” screen, and click on the site, the URL will be something such as:
/wp-admin/network/site-info.php?id=3
That last number is the ID. Go ahead and place that in there, and the domain you want to “map” it to. Once you do that, it’ll be located below.
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That should be it.