Delegating your Ada to Sunshine Stake Pool is simple:
1. Login to your Yoroi wallet account.
2. Navigate to Delegation List tab and search SHINE
3. On the result list, look for SUNSHINE STAKE POOL [SHINE] and click Delegate
You are now ready to receive rewards for delegating your ADA.
To learn more how staking works, and estimate how much richer you are going to get out of staking (wink), visit https://cardano.org/calculator/?calculator=delegator