Click on the blue + button at the bottom of the table - this will add a row to the bottom of the table.

You can also insert rows in between exisiting rows by hovering over the default table & clicking the grey + button that appears.

By hovering over the table and selecting the 3 dots on the left hand-side, you can additionally clone the row & insert it below. This can be useful if only a couple of details from the row need to change, saving you from re-typing the whole thing.

Information can be added, in bulk, to a default table by copying/pasting data from your spreadsheet into a Text, Number, Time or Date field (see walkthrough video below for more details).