I'm going crazy wondering the same thing. And half their website is in Russian and some parts don't have an option to translate. Can't figure anything out. Contacted support, nada.
This service is not friendly, they work in Russia and they do not even have an official thread on top1 russian webmaster forum. I hope most people would use paypal since it is now available in Russia (since sept 2013).
IS not friendly yes , and not safe they just scam me 50 USD because their exchange - top up service is a big mess they say that cant refund cant top up ...
I would say to avoid webmoney as it doesn't seems to be official in Russia as well. Also, many people have become victim of webmoney. I have done some research and found many complains regarding them on several forums.