I have adobe digital edition 2.0 and I am trying to authorize my erreader, but I am unable to find the 'manage library' before I open ADE.

I have adobe digital edition v2.0 and I am trying to authorize my erreader, but I am unable to find the 'manage library' before I open ADE.  Where to I find the 'manage library'? and should I upgrade the ADE to version v1.7.2.?