WordPress MU

Hi,

I have installed wordpress MU (in the root http://domain.tld)

When I log in as admin everything works fine. But when I register a test user, it send me an email saying please activate. But the format is http://blogname.domain.tld
And by default the activation does not work as my I have not activated the wildcards.

I want the format to be http://domain.tld/blogname
While installing wordpress mu it did not give me any such option which I could select to choose this option. Please can someone help

You'll have to reinstall it and choose the subfolder option.
Yes it *is* there on the install page - there's two radio buttons and they're kind of hiding in a lot of text.

it's right above where you put in your database details.