You can do anything you like in this menu without altering your system except for ``Commit'', which will perform any requests to alter your system you may have made. Some of the menu options will also have direct `Write' commands available for commiting an operation immediately, but they should only be used if you are absolutely sure it is necessary. It is generally better to make your changes and then commit them all at once so that you are left with the option of changing your mind up to the very last minute.
If you are confused at any point, the F1 key usually pulls up the right information for the screen you are in.