When a trainee records an activity in their portfolio, they can give it a predefined category. This is done on the activity form itself and can be done either as the trainee is creating the activity, or added later by editing the activity.
Step 1: Open or create the activity to be tagged.
Step 2: Choose a category from the drop-down box.
Step 3: Click on Submit or Save Draft.
Read our article: Organising Trainee Activities: Categories for more information on categories.