How do I link my DID to my account addresses?

You can link your DID and your web3name via 

this website. You do not require a web3name to link your DID.

Your DID can be linked to as many of your addresses as you want across the Polkadot and Ethereum ecosystems.

Linking an address requires a transaction fee (currently around 0.0045 KILT). 

NB - don’t link addresses that you don’t want connected to your DID! If you want to keep an address private, don’t link it.