How to add money to CoinPayments? I need to make a transaction of 0.00744000 BTC using the site CoinPayments.net. However, when I click on "Add new deposit address" in my wallet, I can see a 34-character long code. 
Next to it, there is a button "Deposit with Bitcoin client", but when I click on it, an empty tab opens in Chrome. In Chrome's address bar, I can see the 34-character long code and the prefix bitcoin:.

However, I don't understand how am I supposed to make the transfer then? I need to convert $50 from my bank account to BTC.
"Deposit with Bitcoin client" does the opposite of what you need to do.

(Though I'd read this before making any transactions on that website.)