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Note: This tutorial assumes you have set additional post/link categories in WordPress.
WordPress sets the default post category to uncategorized, which you are unable to remove without some work. If you wish to remove it, follow the directions listed.
Change Post Category
Look for Settings (left hand side of the page). Click the downward arrow to the right of Settings and it will drop down a listing of options. Click Writing. For Default Post Category, select the category you wish to set as default. Click Save Changes.
Remove Unused Post Category
If you wish to remove the old default post category, look for Posts on the left hand side of the page. Click the downward arrow to the right of Posts and it will drop down a listing of options. Click Categories. All except the new default post categories will now display a checkbox in front of it, indicating it can be delete. Hover over the category name and a delete link will appear. Click the delete link. A message box will appear stating:
"You are about to delete this category ' Uncategorized' 'Cancel' to stop, 'OK' to delete."
Click OK. The post category will be deleted and no longer show up on your WordPress Blog.