Now i lost my forum admin account how to back it or make a new controller one ?

What forum admin account are you referring to?

Did you lose the credentials to your own forum installation? If so, you may want to Google for it yourself. Resetting users highly depends on which forum software you’re using and not so much on which hosting you use for it.

So even if you would say which forum software you’re using or a URL where we can check it ourselves, you may have more luck on more specialized sources.