Add anotation on ingress in a running project

I want to add few annotation in ingress on a running kubernetes application, please help

Cluster information:

Kubernetes version: 1.18
Cloud being used: (put bare-metal if not on a public cloud)
Installation method: rancher based
Host OS: linux
CNI and version:
CRI and version:

You can format your yaml by highlighting it and pressing Ctrl-Shift-C, it will make your output easier to read.