It's really simple, if you don't know why to donate then you shouldn't.  

Here you several options for donation:

• Direct donation via PayPal
• Indirect donation via Flattr
• Indirect donation via Amazon Wischlist

Which way you take is your decision, we want to thank you any way. 

Direct donation via PayPal

With this button you can donate with PayPal.

AMAZON Wishlist

On my Amazon Wishlist are thing I would like.

Indirect donation via FLATTR

Flattr is a micro donation platform if you like to donate periodical to many people.