on the main page, click "customize this page"
Then click on the gear wheel beside the title you want to change... Change it and save then click finish customizing at the top...
I think that is what you want to do.
That doesn't work for the Wall Box, there must be another way or file where you can edit the Wall Box text. There's two tabs and the one with The Wall text doesn't have the gear wheel beside it to edit. I tried editing the other one with the gear to see if it would change the Wall Box text but it didn't.
Oops saw that! maybe in the CSS at the moment. I am on a steep learning curve with the CSS but it may be configurable there, or in languages... Oxwall team will be able to tell you.
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