Serial.printIn Issue

This is my first post on the forum, sorry if it's in the wrong place.

I just got an Arduino a few days ago. (Arduino Starter's Kit, with an Arduino Uno). In tutorials in both the book and the website, they make use of a function: Serial.printIn(). This function, in the example codes, turns orange and bolded when used, signifying that it's a function.

However, that is not the case for me.

Serial.printIn (or any other variation of capitals) is not known by my program, Arduino 1.0.5-r2. It does not appear bolded. When I try compiling code with Serial.printIn used in it, it gives my the error:

error: 'class HardwareSerial' has no member named 'printIn'

I downloaded this version a few days ago, so it is very recent.

What is the problem?

Which board do you have selected?

It's "println" (lowercase 'L') not "printIn" (uppercase 'i')