Permalink issue

Hi
I am using this plugin, this is a nice plugin but there is an issue. I want to enable single portfolio view. I changed the code and put title to go their single page but there is a 404 error. Can I enable the title of portfolio so that its go for its single page.
Please let me know what to do for that.

Thanks

https://www.ads-software.com/plugins/wp-portfolio-gallery/