Embroidery and Sewing

My serger isn't working properly. I bent my sewing needle and now the thread won't form a chain. What to do?

I tried to pull back 5 times already. Also the lower looper thread keeps breaking.
Okay, maybe I should add more details because I do not get the right answers. Of course, I changed the needle was bent and after reading the manual.

Change the needle! You can make things worse by trying to serge with a bent needle.

Then, delete all son. Get your manual. Now, step by step, follow each step in the manual threading.