Q: How to connect my Macbook Yosemite to my Epson XP-625 printer

Have you tried printing when connected via USB?

Did you follow Epsons instructions?

Did yo download the Yosemeite drivers?

http://www.epson.com/cgi-bin/Store/support/supDetail.jsp?oid=157803&infoType=Dow nloads&platform=OSF_M_X10

Also see:

iMac can't see wireless printer Epson XP-625

Reset the printing System. Go into System Preferences > Print and scan. Hold 'control' on the keyboard and click in the white box on the left side. You should have an option to 'reset printing system'. Do this and put in your admin password. Restart computer.

While the computer is restarting unplug everything from your printer for 30 seconds.

Now power printer back on, add it back in system preferences > print and scan

See if you can now print.

Also, how is the printer set up wirelessly? Does it make it's own network? Connect to wifi via wireless, or connect to a router via ethernet or USB?

WiFi Printer to WiFi Network - Connect