Hey there,
Do you mean that you want to rename the 'Categories' on your toolbar as shown in the screenshot?
If yes, you can language override the following language constant which is at
Backend > Extensions > Languages > Overrides:
COM_EASYBLOG_TOOLBAR_CATEGORIES
Can you have a try and see how it goes?
If no, can you provide us with some screenshots so that I can have a better understanding of it?