Not recognising my username

I have a WordPress.Org website for my blog. I have had it for 8 months with no issues, however I am unable to log in now. I have requested new passwords but still can’t login. I get a message saying that my webpage doesn’t recognise my user name. My username hasn’t been changed. I am not that computer knowledgeable. I have the same problem with my laptop and tablet. Please can anyone help.

My website is http://www.chrisomalley.co.uk.