R phyloseq and GTDB

I am new to the microbiome analysis community. I am trying to analyze an amplicon analysis from cpn60. I would like to study the sample’s taxonomy with R phyloseq and GTDB. However, I don’t know how to use the GTDB taxonomy table to apply to the phyloseq function.

physeq <- phyloseq(otu_table(seqtab.nochim, taxa_are_rows=FALSE), 

Thank you for your help,