Board Thread:Support Requests - Getting Technical/@comment-25632353-20140602165449/@comment-452-20140602165842

The Portal namespace isn't enabled by default, it's a custom namespace which is only enabled on some wikis.

You used to be able to have it enabled by request, but I requested another custom namespace a few months ago, and was told that they no longer enabled custom namespaces.

You can try to request it via Special:Contact - if they do enable it for you, please let us know. :)