Guy,
For the Friends module, it looks like you've overridden some of the styles in the module's template file. Normally, at line 23 is the following:
<div style="position: relative; top:0px; left:0px; z-index: 100;" id="jfbcfriends">
In your module, it's:
<div style="position: absolute; bottom:20px; left:0px; z-index: 100;" id="jfbcfriends">
That absolution positioning is what's causing it to be in the very bottom of the tab.
As for height, there is no way to specify height specifically, but you can specify the maximum rows. This, combined with the width determines the overall height of the module. However, please note that the Friends module shows only a user's friends who have connected on the site. Therefore, if there are no friends on the site, the module will look empty. If you have it set for 10 rows though, it may show up to about 100 friends, given the width you've provided.
Finally, with the required CB fields, if you still have left those marked as required, other users may run into the same issues as I did where their account is not properly created. We recommend you mark those fields as optional for now.
Thanks,
Alex