You can log in to Amazon on a computer by following the steps below:

1. Open your browser and enter the URL of Amazon's official website (www.amazon.com) or search for "Amazon" in the search engine to enter the website.

2. Click the "Hello, Sign in Account & Lists" button in the upper right corner of the website, or directly click the "Sign in" button.

3. On the new page, enter your Amazon account and password, and then click the "Sign in" button. If you have not registered an Amazon account, you need to register an account first.

4. After a successful login, you can browse products on the Amazon website, add products to the shopping cart, and perform checkout operations.

It should be noted that in order to ensure the security of your account, it is recommended that you do not use public computers. Be sure to log out of your account after logging in to prevent others from using your account for malicious shopping or other operations.