Until you’re very familiar with WordPress it can be difficult to find where to modify some of the features. It’s easy enough to add a new category for your posts right from the Write Post page. Over there on the right just type a new category in the box under Categories and click Add. Or add several categories at one time by separating them with commas.
The default post category can be changed from “uncategorized” to your choice of category by going to Options/Writing.

Writing options shows the default post category of “uncategorized.”
At the default post category dropdown box, pick one you like and click on Update Options to make it so.
Add a new category by going to Manage/Categories. The trick here is that you can delete the uncategorized category after another category is selected as the default.

Manage categories for WordPress blogs.
You picked the category you want as your default in the Options/Writing screen, or here you can click on add new to add more categories for your blog. Then, in the far right column, delete the uncategorized category.
A warning box pops up to alert you that you’re going to delete a category and that the posts that were assigned to the category to be deleted will now be assigned to the new default category.

Alert box shows you’re about to delete a category.
Click OK to make it so. You’ve gotten rid of the uncategorized category.

Thanks so much. You had the answer I was looking for (which I had been searching for on and off for a couple days now!)
You’re welcome! That’s why I post my found solutions – sometimes it’s hard to find these little nuggets.
Keep bloggin!
Greetings from Ukraine! Your post was really useful for me. Many thanks for your help!
Greetings!
Thanks for the kind words! Keep bloggin’!
Thank you, this was actually very helpful. I had no idea how to get rid of that thing.
You’re welcome, Robert! Have fun bloggin’!
Fantastic, thanks!
You have a nice site there, Shaun. Good luck bloggin’!
Started a new blog and searching for get rid of this uncategorized category. Thanks a lot dude.
Sure thing, kishore! Good luck.
thanks, dude, couldn’t figure it out on my own
Hi dv0rsky!
You’re welcome!
Thanks for sharing this information. good luck
You’re welcome, Vanessa!
Good luck to you too.
Thanks for all the help. It worked!!
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Thanks so much.
i was looking all over for this
superbb and exact information, i am looking for it around 2 hours….and i saw this post in serp and found to clear my doubt…thanks to share…