Q: How can I connect to my printer an EPSON Xp-425

& What is the trouble?  Error message?

I do not see your printer listed here:

About AirPrint - Apple Support

You need to buy the right printer.

The iPad uses a print technology called AirPrint. Airprint is a particular communication protocol that flows over WiFi.  So, having a WiiFi printer isn't sufficient. The printer needs to be of an Airprint variety of WiFi.

which I can't connect to laptop either.

I'd contact epson.

Once you get the printer working, you can...

printing to a non-airprinter from an iPad

To print from the iPad, your going to have to install some more software:

-- install a printer app on the ipad. many printer makers have iPad applications for their printers.  Look in the app store

-- install enabling software on a computer which you have connected the printer

For a comprehensive list of links,

   see Texas Mac Man list:

     https://discussions.apple.com/message/21291967#21291967

   or

     http://ipadhowtouseit.com/ipad-printing/

Hi If your printer has a screen go to settings & enter your router wireless key into printer. I use an app called print central can print from al my Apple  devices. Cheers Brian

Helper app -- /print n share

Print directly to the widest range of network or WiFi printers available in any app. Alternatively print via your computer to ALL printers including USB & Bluetooth printers. View read and display large PDF, Office & iWork files. Easily transfer & store files from the Cloud or your computer.

https://itunes.apple.com/us/app/print-n-share/id301656026?mt=8