1) As the mining stage has ended, the only way to own and earn additional Electra is to buy it directly from an exchange listed here.
2) If you wish to earn additional Electra by staking, you must start by download one of the desktop wallets from the "Downloads" tab, install, launch and wait for it to sync. If you have trouble connecting to nodes, find active ones here and add them manually.
3) Transfer your funds from the exchange to the address generated by the wallet. Ensure the wallet is unlocked and staking should begin.