How to set the LEAD event for successful form submission in FB pixel?

Question

Facebook

There is a pixel code that I posted on the site.
What should I do to account for the successful submission of the form?
How to place reachGoal in the form handler in the metric?
By type:
if(send == success){
_fbq.push(['track','Lead',{ content_name: 'CONVERSION-NAME', value: 0.00, currency: 'RUB'}]);
}