How to change url name for custom posts in the address bar
If you have any of our latest themes – you have the option to change the slug for the custom posts (video, gallery, event) and for their category pages. This can be done by accessing the General tab of the theme options panel, the options should be placed at the end of the list.
First of all, you’ll need to change the name in the inputs and click the save button. After you new settings with the new slugs are saved, you will need to reset your permalinks. In order to do that you will need to go to the WordPress Dashboard Settings -> Permalinks tab. There, you need to click the save button. No need to change any of the settings for the permalinks, just click the save button.
If everything is done right, you will get new URLs and no 404 pages will appear. If you get the 404 error after this, try to check again your settings and reset the permalinks again. Also, clearing your browser cache could help.