First of all, open the "WheresMyRefund" website in a standard web browser. Then click on the "Check My Status" link on the page and provide your personal information. Click on the "Submit" button so you will get your status. You can also use the IRS2Go App to check the status on your mobile phone.
In United States, each state has its own process for handling state. Luckily, each state with an income tax also has an online system that lets you check the status of your state refund.