Firstly to begin adding a condition, create a new or edit an existing conversation. Once viewing the conversation you can drag and drop a condition from the right side menu. Once the condition is dropped into a suitable place on the timeline you will be presented with the type of condition you wish to ask in a menu on the right side of your screen.

Now select, 'Delay' from the menu. You should now see the fields possible to fill in for this condition type.

Adding a delay condition will add a delay to when your respondents will receive any questions or messages below the condition. You can add a delay of any fixed amount of time - Days, Hours, Minutes. To add this delay, simply type the amount of time into the input fields with the above corresponding labels. 

Once these fields are all completed, press the pink 'Save' button at the bottom of this menu. This will add your condition into the place within the timeline where you dragged and dropped it to and affect the elements (questions, messages and other conditions) below it.