it's so easy to use rainmeter. you must try it one by one until you find the way to customize it... just use a basic enigma features first... then you can download another skin after you know what to do next

go find manage skin, then from there you can select which part you want to have on the desktop, but you need to load everything first before it can show up. then you can customize to make it draggable or not... you can edit the skin if you want to change the appearance of the skin too. To save the themes you just select, go find manage themes... save to whatever name you want and click save.