Pop Up window won't go away

Welcome to the Apple Discussions. Open the iWeb preference file, com.apple.iWeb.plist, and change the Key "dismissDotMacUpsellWindow" from false to true. You can use the free Pref Setter. Launch it, search for iWeb and then search for "dismissDotMacUpsellWindow". If you don't have a Key by that name create a new Key by that name, set the Class to Boolean and the Value to true and save. That should get rid of the reminder.

Happy New Year

It's located in your User/Library/Preferences folder.

Go to Home Folder/Library/Preferences, click on com.apple.iWeb.plist.
Do Command I to get info.
In the Info window select "open with:" by clicking the triangle downwards and click "other" in the menu to browse to Pref Setter.app and select it.
Now double click the iWeb .plist in the preferences folder and it will launch in Pref Setter.
Click the "Actions" button and select "Add New Key" or do Command K.
Type "dismissDotMacUpsellWindow" into the "Key" box.
Click on "String" and select "Boolean".
Click in "Value" and type "true".

Download it from here....

http://www.nightproductions.net/prefsetter.html

... and drag it into your applications folder.

Browse from the info window and select it.

You have to have a Key selected in the .plist for this to work. Have you tried Actions/Add New Key or Command K?

there is no need for another app, see my post in this thread:
http://discussions.apple.com/thread.jspa?messageID=8208551&#8208551