You can add an activity directly from a profile. To do this first click into a profile then select the Activity tab. Then click "New Interaction."
Then, select an interaction from the drop-down to add to the profile. You can choose either email, donation, phone call, meeting, or event attendance and registration as an interaction.
Once you've selected your interaction, fill out the form with information about the interaction you had with the profile.
Once you're finished logging your interaction, click either "Save + View Profile" or "Save + Add Another" to save the interaction. Once the interaction is submitted it will show up in the activity timeline of the profile with the information about the interaction. You can additionally segment on the interaction.