If you go to add your entry and there is no 'Insert your name here' type entry to write over, don't worry. You can just copy and paste the last entry and edit the pasted version to reflect your own details. The important thing is that:
...is always the last thing on the page - the |} needs to be at the bottom of the table. For a more indepth guide to Tables in this software, you can read the Wikipedia entry on it, but it's probably not worth worrying about too much. If you've edited the table and it doesn't look quite right, contact thewikiman and he'll come along and sort it out as soon as he can...