Hello,
To edit the tool settings, you need to be in the Expert user group. Please check with the people in charge of your robot whether you are allowed to change your user group and to add new tools.
The default password is "kuka" (which can be easily found online) - but make sure to do all changes in close coordination with other people using the same robot.
Here is a scenario: Someone has tested a robot program before and it ran fine, using tool 5. Now someone enters new tool values for 5 without telling the other person, with the new tool being 10cm shorter than the old one.
If the first person were to run the file now again, the robot may collide with the table because it thinks that the tool is shorter than it actually is.
Best,
Johannes