func insertRecord(_ recno: Int, blank: Bool) -> Bool

The function appendRecord() adds a new record to the end of file.
If you pass "true", the record will be empty.
If you pass "false", the new record will contain information from internal memory.

{
    // copy record
    dbf.readRecord(10)
    dbf.insertRecord(11, false)
    // modify some values
    dbf.setField(0, "something", 12.34)
    dbf.insertRecord(12, false)
    // add empty record
    dbf.insertRecord(14, true)
    // your code
}