How to Assign a Worker to an Activity:
To assign a case worker to an activity, click on the activity. The activity popup will open and it will show a Case Worker Option. Clicking on this will show the workers which are available for you. You can assign any of the them from the drop down list to the activity.
It will show the list of worker like as shown below.
After assigning a worker. click on save. Now the assigned worker will also show on the activity tile as icon.