You can moderately emphasize text by placing TwoSingleQuotes on either side of the text to emphasize. On most systems, this will result in italicizing the enclosed text.
This is an example of using TwoSingleQuotes on either end of an entire sentence.
This is an example of using TwoSingleQuotes on either end of just this.
Note that if you use ''this over multiple lines'' (in the source), it will not work right. So make sure that you only have one line you put the quotes around.
See also: ThreeSingleQuotes, FourSingleQuotes, FiveSingleQuotes, SixSingleQuotes