[BioC] Fwd: installing Bioconductor in R

[Maggie Cheang]

Hi, I have installed R and being using R for some cDNA analysis. (Mac 
OSX)
I would like to add the Bioconductor in the R
I downloaded the bioconductor package and put the folder in the R folder.
however, when i type library(vsn), or library(Biobase) in R session
R session said can't find these packages.
please kindly advise me how I should do it
and I try to use getBioC() script to run in the R session.. and this 
time they said my R is not configured to run HTTP.. :(
so would you mind to advise me how I can solve either of the above or 
below options?
Thank you so much
Maggie