They're refering to locks on each option. If you press the pencil icon (or equivalent) then this will unlock the row so you can type into it. Perhaps your version of router support softw is newer & the icon is different. There will most likely be some kind of icon there. Oh upon re-reading it, it looks like perhaps a single icon somewhere (might not be on the right-hand side as they say) which unlocks the ability to change the figures. (I was getting confused with mine which is a different brand.)