Installation – how

Hi
I’ve been trying for a month to migrate my blog zafro.net over to self hosting with godaddy at zafro.co.uk.
I simply cannot import my xml content without timing out. The solution of breaking my 16mb xml file down is simply not practicable. I am hoping this importer is a solution but I see no installation instructions on this page.

Please advise how I install this plugin.

Thanks,

zafro

http://wordpress.org/plugins/wordpresscom-importer/