If you've selected a template from our Template Gallery you'll likely want to delete the sample records in the template.
Step 1: select all rows in a table
Quickly select all rows in a table by clicking the checkbox on the left side of the table's header row.
Step 2: delete records
Once you've selected the records you want to delete, right-click on any row in the selection and click "Delete all selected records". Then select "Delete" again to confirm. If you're using a mac device, Holding down the Control (Ctrl) key on your keyboard when you click a mouse button is the equivalent of a right-click on a two-button mouse.
For more on deleting records, please see the support article titled "Delete Records."