Here is a great article walking you through the steps of delegating your Cardano ADA.
https://medium.com/cardanorss/staking-for-beginners-a-step-by-step-guide-6dda110b2454
Below is a quick video on how to stake your ADA on the adalite.io wallet delegating with adalite.io.
Cardano Delegation Cycle
Epoch = 5 days
A few words from AdaLite.io
please be aware that there are multiple websites mimicking AdaLite interface that are trying to steal the keys to your wallet. Please make sure you check the URL in your browser every time you visit AdaLite that it matches https://adalite.io. Never give your mnemonic seed phrase to anyone.