Re: change link of "site logo source image"
You can edit the file templates/tiki-site_header.tpl (or templates/(theme name)/tiki-site_header.tpl if the theme has its own version of the file). Find a href="./" (this may be in the file more than one time) and change it (each instance) to the url you want to use.
-- Gary
;){kind=link}
;){kind=link}