So simple. Look at the upper navigational bar of hitleap website after you logged in
You will see there "Traffic Exchange". Click on it and you will see a Traffic Exchange Button in the center of the page. Check it out and a popup window will popup. For every minute that popup is open, you accumulate points that could be exchanged to views on your site
The default conversion of 100 minutes on HitLeap use would be 50 minutes worth of traffic (50:1). However, you can increase that rate, by taking advantage of the Traffic Exchange ratio Bonuses