Can I use both a wifi shield and an LCD shield on my Arduino Uno?
The WIFI shield you linked to uses SPI, with two SS pins (One for the wifi, one for the SD card). It has a stackable header allowing the Arduino to pass through, so you can plug something in on top of it.

You don't mention which LCD shield you are going to use, or if it's really a shield at all. Adafruit has a 2 pin, i2c based LCD shield, which uses analog pins 5 and 4, which wouldn't interfere. There are LCDs based on i2c, spi, serial, and direct driving (8 or 4 bit), so it really does depend.

For reference, here is the wifi shield pin out, and the arduino uno pin out. You just need a lcd shield that doesn't use the SPI SS pin(s) as the Wifi Shield.