You can deposit Bitcoin to your oblak wallet using any available bitcoin wallet app like Electrum or similar (pick one here: https://bitcoin.org/en/choose-your-wallet).
It's also possible to send directly from a centralized exchange like Binance, Kraken, Coinbase, and the likes.
To make a deposit, first wait until your balance statement is up to date (green circle). Then follow the steps:
You will see the conversion rate at the bottom of the Deposit wizard.
Once you made the deposit, you can track the confirmations using a block explorer like mempool.space.
Refresh the page to force an update of your balance.
Make sure you have read the Disclaimer. Enjoy!