But beware the Apple //e's questionable iconography - they were still learning to be user-friendly. Note that the in- and out-"ness" of the Apple //e cassette port icons are counter-intuitive. They seem to be reversed from what you might expect, doing a literal transliteration of the picture (i.e. Cassette-out means arrow away from cassette, right? Wrong!). Be sure to follow the example carefully.
Apple IIe cassette ports
Cassette-out: Left Cassette-in: Right
The circuit board layout on the //e is identical to the Apple II+ with respect to the cassette ports - so just follow the white wire ("white to the right") and you'll be ok.