On a desktop browser install the MetaMask wallet extension from Metamask.io
You can buy Ethereum on Metamask via the Wyre or coinswitch buy button
Visit ETHHEX.COM, connect your Metamask wallet & trade your ETH for HEX. (always leave some ETH in your wallet to cover gas fees)
To stake your HEX visit go.hex.com , connect your Metamask wallet and stake HEX!
1. Best: ETH or ERC20s: ethHEX.com widget below. (no signup)
2. BTC: Turn BTC into renBTC (no signup) Then Turn renBTC into HEX.
4. Dozens of HEX exchanges.
Buy HEX directly by credit card (Not possible in USA)
A. Directly in metamask via Wyre.
B. Slower, but supports large amounts: Bitstamp is a good option. Coinbase, Kraken, and Gemini are OK too.
C. Credit card or GBP, EUR & INR wire transfers via the widget below. (5 minute delivery possible)
D. Changelly supports cards & wires.