function appendRecord(blankrecord : Boolean): Boolean;

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.

begin
    // copy record
    dbf.readRecord(10);
    dbf.appendRecord(False);
    // modify some values
    dbf.setField(0, 'something', 12.34);
    dbf.appendRecord(False);
    // add empty record
    dbf.appendRecord(True);
    // your code
end;