Where do I find the security token for Salesforce log in?

I'm trying to get Salesforce opportunities created by information in my Jotform.  When I open the Salesforce App when I am editing the form it wants my Salesforce log-in info plus a "security token"  I don't know what this is or how to find it.  Can you help?

The security token is used to allow access to SalesForce via API. Please refer to these links: 

https://help.salesforce.com/articleView?id=user_security_token.htm&language=en_US&type=0

https://www.skyhighnetworks.com/cloud-security-blog/what-is-salesforce-security-token-and-how-do-i-find-it/

Related guide: Flexible-Data-Integration-With-Salesforce

Hope that helps. Thank you.