I´m reinstalling the whole wordpress. if problem persists I´ll make a screenshot! Thank you!
I´ve got the same problem on my site farmaciaribera.es. In my case, a wrong configuration in htaccess was the problem.
It´s better not to edit the htaccess if you are not an expert
Forum and wordpress are not the same account!
If they say it isn´t a valid email format is because your are not giving the right format:
xxxxx@mail.com
Remember that in this step you should write your mail adress, not your username.
Hope it helps
You should ask your hosting. They have blocked uploading files for some reason