Step 1: Select the pencil icon from the left menu. When the pencil tool is selected, the additional icon appears where you can select the pencil color from the color pallet or enter the HEX code.
Step 2 : Select the Record button to start recording. When you are in a situation, where you would like to emphasize a certain part of the slide (e. g. underline, strike, encircle), click anywhere on the slide and hold the left mouse button to start drawing. When you finish recording click the Stop and Save button. Everything drawn in the slide will be synchronized with your voice.
2.1 If you want to erase your drawings, select the Eraser icon from the left menu. Click on the drawing you wish to erase and start erasing it by holding the left mouse button.