If it finds a printer that you don't recognise it may be a neighbour's printer. When you first link up to your wifi printer you may need to enter a code set up with your modem.
hi - you dont state what printer you have? in order to print from any ipad/iphone etc you would need an airprint enabled printer, apples official list is here: http://support.apple.com/kb/ht4356
failing that, your next option is a printing app such as print n share or printcentral