How I can set Field Prepopulator or other type of populator?

Can I import to the form basic information from other source using Field Prepopulator or another form of populator?

Unfortunately, we don't have such feature that can prepopulate field with data from an external source. You can use the prepopulate app to set a value via URL parameters.

You can get the source codes perhaps to do it: https://www.jotform.com/help/104-How-to-get-the-Full-Source-Code-of-your-Form. Add custom scripts that would allow you to do it in the source codes. Or, do it by API: http://api.jotform.com/docs/ (this requires technical API skills).