Unable to Add Row in Excel

It seems that by formatting the sheet as a table, Excel "filled-out" or instantiated all possible rows in the sheet. Thus, new rows cannot be added. Deleting empty rows allows me to add more rows where I want.

I was able to get it to work by (using Office 360):

1. typing the information on a row outside the table,
2. copying the row,
3. clicking on a row inside the table
4. right-clicking and choosing insert copied cells
5. applying the sort
6. deleting the original cells that had been copied

Very likely there is no room for more rows, as your table already reaches the last possible row of the sheet. I assume you have selected the columns only when you defined your table, so the table already cover all of the lot-lot available rows. To solve this, go to Table menu, select "Resize Table", and make your table smaller covering less rows (the necessary ones only). Then you can add more rows with right-click.