Use the menu on the left to browse through the albums. In the top corners you will find the following icons:

Use these icons to add or remove rows and columns from the thumbnail grid to match your personal preference.

Click a thumbnail to view the photo in a larger size, and use the following icons to browse backward and forward:

Return to the thumbnail grid by clicking the photo.

When you view a photo you will find the following icon on the left bottom corner which will start the slideshow:

Enjoy!