Visit https://yoroi-wallet.com/#/

Set up Yoroi Wallet

Choose Shelly Era - Be sure to copy pass phrases and keep them safe.

In Yoroi wallet select your wallet you created in "My Wallets".

At the bottom select "receive".

Select fresh address.

Select "copy address". (Please ensure you selected "receive".)

Go to location where ADA is held (Exchange, another wallet).

Initiate a withdraw of ADA, send to address copied in step 6.

After a few minutes your ADA should appear in your Yoroi wallet, go to next step.

Select your wallet in Yoroi wallet then select "Delegate" in bottom right.

In staking center search for A3C ticker.

Select "DELEGATE" under ticker.