I don’t know the wallet you’re making use of, there are some wallets that grants users the ability to buy Bitcoins with credit card directly through their site. Not all wallets has this feature, some are just serving as a storage. I’m used to buying Bitcoin from Coinbase, it’s very easy and is the most popular way of buying Bitcoin. Some others makes use of Xapo, but I haven’t tried that one. Other good exchangers includes BITX, Bitfinex and CEX.io. These are the only safe exchangers I know for buying Bitcoin.