problems with a wordpress website

robin stocks

Upper dearne woods have a website which was set up by a predecessor of mine about 15 years ago with help fom Kirklees in some shape or form. (I’m not sure how it worked)
I have taken over running it as I had already set up a website.
However wordpress gets confused with one person with the same email address running both sites and usually either wont let me into the upper dearne site or my own. I am completely flumoxed. At the moment one of the websites is locked and I cannot post anything.
Is anyone able to help, please?
Robin (Stocks)