The following steps will lead you through creating a free MyNCBI account:
1) In the upper right corner of a PubMed webpage, click on the MyNCBI link

2) Click on the "Register for an account" link

3) Fill in the requested information and then click the "Register" button

4) You will soon thereafter receive an email in the email account for which you provided the address. After you click on the email confirmation link in the email, your account will be active.