Creating wordpress category

Hi

I'm trying to edit the wordpress engine to create a category for wordpress.

I was able to fill the text box, but after filling it you have to click on add button.

What i've dont so  far:

newcategory=%category%

but now i have to click the add button. How can i do that? there is no form.

This is the button source code:
<input id="category-add-submit" data-wp-lists="add:categorychecklist:category-add" class="button category-add-submit" value="Add New Category" type="button">

Thanks.