Deposit to wallet
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.
Simply copy the address you see in your dashoard as the recipient of a transaction you create with your wallet. Hit the send button, take note of the tx id (transaction id) and paste the tx id in the search bar of a block explorer like blockchain.com. This way you can watch the transaction getting confirmed on the blockchain.