issues with ubunto permissions

I have installed the ubuntu under the virtual box. Installed the ISO image file for ubuntu

I am getting this Error on a folder

can’t add any file or folder, even i try to open a software, its not doing it, how can i fix it

i can run terminal and install apache2 but can’t edit file inside the www folder, as i tried searching SO or the answers but could not see how to fix it, i also checked but none answer is related