v 6.7.6
collections > settings >URL's might help

see also http://b2evolution.net/man/base-url

You can make your own folder /myblog/ with index.php in it and direct to that

My example is that I have a subdomain elf i.e. elf.calstock.org.uk
I made a folder called elf in the root of b2 and place an index.php file in it as follows:
http://forums.b2evolution.net/topic-12423
$blog = 5 as it was the fifth blog I created

<?php

$blog = 5;
# You could *force* a specific skin here with this setting: (otherwise, default will be used)
# $skin = 'custom';

# This setting retricts posts to those published, thus hiding drafts.
# You should not have to change this.
$show_statuses = array();

# Additionnaly, you can set other values (see URL params in the manual)...
# $order = 'ASC'; // This for example would display the blog in chronological order...

/**
 * That's it, now let b2evolution do the rest! :)
 * Note: if you put this file in a subdirectory, you will need to adjust the path below, for example:
 * require_once dirname(__FILE__).'/../conf/_config.php';
 */
require_once dirname(__FILE__).'/../conf/_config.php';

require $inc_path.'_blog_main.inc.php';
?>

Still I have left the URL with the .php ending so elf.calstock.org.uk brings up elf.calstock.org.uk/elf.php

Hope that not too confusing?

@feast4freedom Thanks for the kind words.

Moving to a different folder is dead easy: http://b2evolution.net/man/moving-to-another-folder

@amoun Your solution is more complex than it needs to be ;)

Thank you amoun and fplanque.