Changing the name of a variable from the default

Someone may have posted this before but it would be nice if the WIKI were updated to add the 'missing' step:

After fighting for too long to try to change the default name of a variable to one that was humanly recognizable, I finally found what I had missed, not made clear in the WIKI!

Open the appropriate variables page, in my case the state variables.

Click on the line of the variable you want to name, it turns red.

Click on the name box, which turns white, type what you want for a name (I still don't know must it start with a $ (yes I could have experimented) nor what the maximum length of the name is. But I changed the name in the box

The instructions say you must save it, so I clicked on the "save" box on the bottom of the page. But when I closed it and reopened it, it hadn't saved it.

Why, because of the missing, not instructed step: After changing it, you must click on the line again (turning the whole line red again) before saving it.

Then it will be saved and appear with the new name where it is used.

If the WIKI were amended to add that you have to click on the line again after changing the name before saving, it might save people like me from hours of frustration!