how to share he e print and epson airprint printers using Samsung s4 or note 8

[Claremont]

I currently use an HP e printer but just purchased an epson iprint 2540. My question is how can I choose which printer I want to print from when I'm using my s4 or note 8. I have already installed the iprint app from the Google play store but if I choose to print (e.g. A coupon) and then press the menu button the only printer on the list is the HP. Do I have to make any changes in settings? Look for to your reply.