Connect the laptop to public-epfl wireless (you MUST insert your wireless login/password on the authentication page)
Open the System Preferences application and select Print & Fax
On the Printing panel, select the + to add a new printer
On the new window, select the IP Printer Icon
In Protocol row, select Internet Printing Protocol - IPP
In Address row, insert melpomene.epfl.ch
In Queue row, you have to insert the name of the printer (refer to tables below) prefixed by /printers/
in Name row, insert the name you want for the printer
in Location row, insert the location of the printer, if you want
in Print Using row, select the correct Manufacturer of the printer and then the model of the printer (refer to table above)
click the button Add
on the new windows you have to insert the options for the printers (refer to table below)
click the button Continue
you can print.