Unable to log into dashboard

Hi all,

I believe I have messed up and here I am posting for some much needed help. I was helping a relative update their website but I am not a developer so it has been a struggle.

I had built the final website on dev.buggyman.net and wanted to have that version of the website appear on buggyman.net.

I was using Updraft to back up the dev.buggyman.net version as I was building it and uploaded that to buggyman.net but did not use the migration tool as I would have had to pay for it.

In addition, I then logged into dev.buggyman.net dashboard again and changed the site url details to buggyman.net hoping that this would just change it to be the live website (stupid of me I am guessing).

Now I am unable to log into either dev.buggyman.net or buggyman.net dashboards.
It seems like it redirects me around but none of my log in details work.

When I request a new password I get a message saying the link provided for reset is invalid.

I am unsure what to do at this point to fix this issue. Could anyone advise please?

Thank you very much in advance.

The page I need help with: [log in to see the link]