There are various ways to load up trading pairs and associated data like charts, prices, trading history etc.
Using search panel
Click on the left top corner currency selector which will bring you the currency search panel. You can either search or scroll through the list. To load the charts and other pricing information, click on the currency pair.
Using favorites panel
You can also load data by clicking on the a currency pair card in the favorites panel.
Read about how to add currency pair to favorite list