Old kenmore sewing machine

Question

i have this old machine (gift) it looks antique, black with silver and gold writing of Kenmore. Its been refurbished, but I can't get the thread to sew, it keeps popping out of the needle. I have the tension of the thread down to none and that's not working. So what year is this model and any suggestions on my problem
MODEL Montreal Can
CSA Approval No. 596
thank you your assistance is appreciated