Limma with already normalised data

Question

[BioQueen]

Hi! I have only access to already normalised data(RNA-seq high troughput). I have one data frame of the normalised count data and one data frame with the metadata. I want to use Limma since I have read that Limma can take already normalised data to find DEGs. But how do I use limma when I have two different data frames and not a count matrix?

Thanks