To authenticate yourself on YouTube, you typically need to sign in using a Google account, as YouTube is owned by Google. Here are the general steps to authenticate yourself on YouTube:

Create a Google Account:
If you don't already have a Google account, you need to create one. Go to the Google Account creation page and follow the instructions to set up your account.

Access YouTube:
Once you have a Google account, go to the YouTube homepage.

Sign In:
Click on the "Sign In" button located at the top right corner of the YouTube homepage.

Enter Your Credentials:
Enter the email address associated with your Google account and then enter the password. If you're using a public or shared computer, make sure to uncheck the "Stay signed in" option for security reasons.

Two-Factor Authentication (Optional):
Google highly recommends enabling two-factor authentication for additional security. You can set it up in your Google Account settings.

Authenticate:
After entering your credentials, click on the "Next" button. If the information you entered is correct, you will be signed in to YouTube.

Complete Your Profile (Optional):
You may want to customize your YouTube profile by adding a profile picture, cover image, and other details. This step is optional but can help personalize your YouTube experience.

Verify Account (Optional):
In some cases, YouTube may require additional verification, especially if you plan to upload videos or perform other actions that require account verification.