XO-Ferg, yes, I'm afraid credit card payments are not available at the moment. The best option for you will be as follows: buy a paid service/package on your uCoz website for the amount, approximately equal to the cost of the domain renewal. Then contact the domain support, and they will cancel the package and will transfer the funds to your account at domain.ucoz.com.
Can I do it through the "Robokassa" payment option? Don't know what the drop down options are because they are in Russian. And how do I contact domain support? Also do I have to buy a paid service for ventlyfe.com or can I buy a paid service for another uCoz website that already doesn't have a paid service/package?