Help completing a suggested focus in Be a Pro.

Hi, I’m playing as a defenseman in Be a Pro. I have a suggested focus to complete that is titled “Guard the Net,” and I have yet to even do this once. The specific description of the task is:

“When the opposing team has the puck in our zone as a defenseman your job is to guard the net from opponents.”

I feel as though this is what I’m already doing while playing defense anyway, does anyone have any suggestions for how to complete this?