Screening for new highs is quite simple. One of the easiest ways to get started is simply to go to the 52 Week Highs Screen and click the Duplicate button at the top right of the list. This exports the rules to your own version of the screen which shows you how the rule was created.
You can also see a list of new highs and lows on the Chart Signals page, which you can find on the dropdown from the Toolbox button at the top of every page. Here is the link to Chart Signals Highs and Lows lists: