You can sign in to www.YouTube.com website by using the username and password of your Google account. You will have to click on the ‘Sign in’ button which is located at the top right corner of the YouTube web page. You will have to type the username and the password of your Google account in the ‘Email’ and the ‘Password’ fields respectively. Then, click on the ‘Sign in’ button to get access to your YouTube account. You can enable the checkbox ‘Stay signed in’ so that you will be able to login automatically when you visit the website again.