If you don't have an Indeed account
Click the Edit link at the bottom of the alert email. Edit the keywords in the What box and/or the location in the Where box. When you're finished editing, click Save Changes.
You may want to create an Indeed account to give you full control over adding, deleting and editing all of your alerts in one spot. With an Indeed account, you can also temporarily pause an alert. You can create an account here.
Another benefit of an Indeed account: once you've confirmed the email address for the account, you don't need to confirm any alerts created under this account.
If you do have an Indeed account
Use the Alerts tab of your account to manage your Job Alerts. Click the edit link next to the alert you would like to change. Be sure to click Save Changes when you're finished.