Virtualbox screen bigger

I have the the newest version of KDE security of parrot on virtualbox and I have no clue how to make the screen bigger I tried to install guest addition but when i clicked on it from the virtualbox window it literally did nothing how do i fix this?

I would check VirtualBox documentation

I have this same problem in other Linux installs. You may need to open the guest addition CD and copy the VBox*.run file to to a local directory. Then you will need to chmod to add execute permissions. Then run it locally and it should install properly.