You can access the system configuration through the Stores > Configuration > WebForms admin page.
Salesforce Integration Add-on
General settings that are required to connect Salesforce Support and Magento.
Your Salesforce Connected App consumer key.
Your Salesforce Connected App consumer secret.
You need create a new connected app from the Platform Tools > Apps > App Manager page in order to retrieve the consumer key and secret.
Your Salesforce username.
Your Salesforce password.