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The easiest way is to use the swap feature in the Hive Keychain wallet.

Other than that you would have to swap it to Hive, then bridge to Hive-Engine using either Beeswap or Tribaldex, then swap it to LEO.

Hive Keychain does all that for you in the swap feature, that's why it's the easiest.

where do I buy leo token now ?

Tribaldex, Beeswap, or LeoDex

LEO is a second layer token on the Hive blockchain and is not available on your regular centralized exchanges so you can't buy it with fiat.

LeoDex.io lets you buy it with coins other than Hive like BTC, ETH, and others. With Tribaldex.com and Beeswap, you have to have Hive to swap to LEO and bridge your Hive to the second layer.

The best way to acquire LEO is to earn it! You can do this by getting involved in the community and engaging. People will upvote you if they feel you have provided value. Another way is to stack your Hive Power and delegate to the leo.voter account. This earns like 12-15% APY that pays out either in liquid LEO or staked LEO daily.