Re-Attaching Yarn?

Can some one tell me how I am supposed to re-attach yarn?
I am so confused , I need to re-attach yarn to the other side a of a neckline.
Thanks in advance for any and all help .

Terri
:knitting:

Just start knitting with it. It’ll be a little loose at the edge, but you can fix that when you weave in the end.

Thanks Jan! I will try that.