From the Admin Dashboard, expand Early Years and select Daily Diaries.
Expand the relevant child's diary, then the 'What else...' section. For detailed information click the + next to Toilet Times or for summarising use the Nappy Changes section, or use both, the choice is yours.
You can add multiple entries by clicking the + again and delete an entry by clicking the red x. The diary will autosave every few seconds.
What the parent sees
This is how the above section is displayed on the Parent Portal.