DY-SKTYWindow Bird Feeder with 5 Extra Strong Suction Cups, Drainage Holes, Detachable Seed Tray

I live in the city and am looking for something small enough to keep pigeons away? Will this attract only smaller birds?

My feeder arrived with the perch seperate- not attached. I see nothing ion the instructions on how to attach? was it supposeed to be already in place?