Delete code

Hi, I find Your plugin very useful and everything is working fine for most but I can’t delete a code snippet when I want; sometimes I just make a new snippet to only try something but I don’t need it but it is impossible to delete it. I get the whole warning message and warning and I accept it but nothing happens…Not a big problem but I have a lot of snippets and would like to keep it clean:-) Thanks

https://www.ads-software.com/extend/plugins/php-code-for-posts/