Can anyone tell me how I can have 'Private comment' checked by default. What do I need to edit?

Thanks for your help!

place $_zp_comment_stored[5]=1 just before you call printCommentForm()

Thanks, appreciated!!!

One more question. I keep getting errors, where would you place that line:

If you haven't I suggest to read the theming tutorial and look at the standard themes.

I have actually but I have no php knowledge. Is going to take me a lot of time to figure out what's going on that's why I thought i'd ask I was hoping it would be easy for you to point out where exactly to place the ' $_zp_comment_stored[5]=1'

sbillard already told you where to place that above...