Well done in getting there in the end!
You can't delete system apps like that, no. Some roms come with most of the crap removed. To do that yourself, I find the easiest way to do it is to use Titanium Backup... the free version will do. Careful you don't delete anything important!
Another free way to do this is to use ES File Explorer. Set it to Chuck Norris mode and you can delete apps directly.
These things are not possible without root access that you just enabled.
Ask if you need help
Yes, delete the image folder now and everything in it.