[Lynne]

1) It is a template_hook in the memberinfo_block_statistics template:

{vb:raw template_hook.profile_stats_last}

So, in your plugin you would just assign what you want to the variable $template_hook['profile_stats_last']. You should take a look at the template so you have an idea how to format the html your your output.

2) If it is the person's profile, then use the variable $prepared for it.