While in the Editor for the Summary, click on "Filters"

Next add a Filter Title, and choose a filter type:

Next select the field to filter by. Click SAVE.

Now the filter can be used by clicking on "Filters" in the upper righthand corner.

The next time this Summary is accessed from the Hub or a Collection, you will be prompted to filter your Summary. You can either select your filter OR if you choose to open the Summary without a filter, simply click RUN.