Due to Russian Federation's Central Bank's decision to stop supporting operations with e-wallets for these services you need to issue a virtual card from the service that you want to use.
The virtual card for QIWI can be issued here: https://qiwi.com/cards/qvc
The virtual card for UMoney can be issued here: https://yoomoney.ru/cards/virtual
This is instantaneous and free, you will get the requisites for card that is tied to your e-wallet. This card can be used in any shop in Russian Federation.
Next, using this virtual card you can make a purchase on the ZennoLab website or in the User Area just like with a regular bank issued physical card. You should choose Tinkoff bank to avoid incurring comissions from RUB -> USD convertions.