You have to have some ETH in your private wallet such as MetaMask, Jaxx, MyEtherWallet, Ledger Nano!
I think that of these purses from the list of the most popularnym will MyEtherWallet, it is the most safe.
Certainly MyEtherWallet most popular wallet, but I would not say that it is the best and functional. Personally, I use MetaMask.