MyBB Community Forums

I have a question.
I found a theme on the web that did not work. I would like to keep the ground structure and change everything else. I do not want to do another person's work, but I do almost everything completely. Only the structure is preserved. Is that okay?
The creator I can not ask because he is unknown to me and no information in the theme.

I would never recommend using somebody else's work without permission. Depending on who/the purpose of the theme it may be free and usable though, could you show us the theme? But in general no, you shouldn't be taking peoples work and changing bits to call it yours, if that isn't your intent I'm sure you'll be fine.