Select the work highlight for which you would like to add the description from the 'Matters' tab from the bar at the left of the screen.
Click on the three dots at the top right corner of the screen. A dropdown will appear. Select 'Edit'. A popup with the matter details will appear on the screen.
At 'Client Descriptions' category choose the language of the description you would like to enter.
After selecting the language, a tab in which you can write the description will appear. Select 'Update matter' at the right bottom corner of the popup to save the changes.