Here is the Staking Explorer link: https://staking.harmony.one/welcome
Using the Staking Explorer is an easy way to stake, delegate, send funds and control all information associated with the validators.
First you need to login into an account , you can create new address or using an existing address, for example your validator account that you created using CLI
After you login, there are several option available, for example you can check all available validators that you can delegate
For each transation/delegation you will need to confirm it, for that you can use several ways, using Harmony Browser Extension or ledger nano S.
Harmony Browser Extension: https://docs.harmony.one/home/wallets/chrome-extension