After installing you choose Gadgets in the Gadgets Window

Click on the + button on top of the Sidebar to make the Gadget windows apear. So you can select the Gadgets you want

Click for an complete overview and explanation off all vista sidebar gadgets
Clock	Calendar	Battery	Calculator	CPU RAM	Hard Drive
Mail	Media Player	Picture Slider	Recycle Bin	RRS	Internet Search
Weather	Wifi	Data Transfer	Softonic	Sticky Pad	System uptime

Click for an complete overview and explanation off all vista sidebar gadgets

You can select different skins for the Clock Gadget , Click the + button on top of the Sidebar and then on the Clocks Button.
Then the clocks Sin window Apears. Select the Clock Skin of your choice and the Clock Skin appears on the Sidebar.