IIRC TKL doesn't automount cds so you'll need to do that manually, once the CD is mounted then it should be very straightforward. Obviously the VBTools ISO needs to be mounted as a virtual CD from the VBox GUI.
Then in your appliance terminal you can double check whether a CD is already mounted with the mount command:
mount|grep cd
If this returns nothing then find your CD drive
ls /dev|grep cd
this should give at least one result (possibly more). You may need to go through them all to find the right one, but generally it'll be cdrom or cdrom0 or similar. Assuming we're trying cdrom0
mkdir /mnt/cdrom0
mount -t iso9660 -r /dev/cdrom0 /mnt/cdrom0
Now have a look and see what is in there
ls /mnt/cdrom0
If you've got it right then it should list the files on the ISO, one of which should be VBoxLinuxAdditions-x86.run or similar. (If you haven't then repeat steps above with cdrom1, etc). Run the installer like so (note Linux is case sensitive; also adjust the path in the first line as required):
cd /mnt/cdrom0
./VBoxLinuxAdditions.run
Assuming all goes well reboot and check that it works. Hope that does it for you!
I haven't done it but I don't think it should be too hard
From a quick Google it seems that you need to install a few pre-requisites:
IIRC TKL doesn't automount cds so you'll need to do that manually, once the CD is mounted then it should be very straightforward. Obviously the VBTools ISO needs to be mounted as a virtual CD from the VBox GUI.
Then in your appliance terminal you can double check whether a CD is already mounted with the mount command:
If this returns nothing then find your CD drive
this should give at least one result (possibly more). You may need to go through them all to find the right one, but generally it'll be cdrom or cdrom0 or similar. Assuming we're trying cdrom0
Now have a look and see what is in there
If you've got it right then it should list the files on the ISO, one of which should be VBoxLinuxAdditions-x86.run or similar. (If you haven't then repeat steps above with cdrom1, etc). Run the installer like so (note Linux is case sensitive; also adjust the path in the first line as required):
Assuming all goes well reboot and check that it works. Hope that does it for you!