Follow these appended instructions on how do I find my Security Token.
When you access Salesforce from an IP address that’s outside your company’s trusted IP range using a desktop client or the API, you need a security token to log in. A security token is a case-sensitive alphanumeric code that you append to your password or enter in a separate field in a client application.
Your security token isn’t displayed in your settings or profile.
If your admin assigned you the Multi-Factor Authentication for API Logins permission, use the code generated by an authenticator app, such as Salesforce Authenticator, for the security token value.
A new security token is emailed to you when you reset your password. Or you can reset your token separately.