This is probably too late, but maybe it could be somehow useful for somebody else...
a simple way to create a footnote with a star symbol could be like this:
add to the preambule:
\newcommand{\footstar}[1]{$^*$ \footnotetext{$^*$#1}}
and whenever you want to add a footnote with a star in your document, you just have to use:
\footstar{whatever your footnote with star is!!}
This worked for me, and it is specially usefull when you want to add footnote inside of a table and you don't want to have a number in your footnote.
Hope this could help someone
Best,
Daniel