Note: Take extreme caution in modifying the system paths. One invalid modification might render your whole system unusable.
Press "Apply" to have the changes you've made written to the &cfgsys; file. This will write the changes to all system paths available in the drop-down box, not just the changes of the path that is currently selected. You will have to restart the computer to let the changes take effect. A Desktop restart does not suffice.
The "System paths to check" drop-down box offers you a selection of system paths that can be modified using this page. See "System paths" for more explanations.
Once you select a &cfgsys; item, the paths that are specified with it in &cfgsys; are displayed in the list box below. You can then select items in that list box and use the buttons to have them modified. This should be pretty self-explanatory.
The "Select invalid" which select all path entries that are not
valid directories on your system. You can then press "Delete" afterwards
to have these entries removed.