How to assign an icon to a category

First :
PUT SAME FOLDER PATH ON THE SERVER WHERE ICONS ARE OR WILL BE IN BOTH FIELDS IN OPTIONS FORM AND IT WILL WORK.

In WordPress 2.3.X :

Go to Manage > Category Icons and click on Icons tab.

Manage icons

In WordPress 2.5 :

Go to Settings > Category Icons and click on the Icons tab.

Manage Icons WP 2.5

In WordPress 2.7+ :

Go to Posts > Category Icons and click on the Icons tab.

Icons tab

Icons tab

If you want to delete the icons of a category and its priority, click on the checkbox in front of it, and then click on the button “Delete Icons and Priority”.

In the “Name” column, click on the name of the category to edit or select its icons.

Select Icons WP 2.5

In the dropdown menu icon or Small icon, select an icon among the ones you uploaded in the default folder (wp-content/uploads) or the folder you’ve choosen to upload them. And then click on the button to the right to validate.That’s all.