OK, so everything seems to be installed correctly (biblatex finds the styles).However, the bibliography is not found.Did you pass the correct path to the \bibliography environment? Could ou posta small example file?
You mean in the preamble? I have mentioned it there:
\usepackage[style=authoryear,natbib=true]{biblatex}
\bibliography{<name>}
Here is a small Lyx-File, in report-class with biblatex. I also add a
small testing-bibliography.
I hope you could use that. Best* Jess
testbib.bib
Description: Binary data
testreport.lyx
Description: Binary data
