I didn’t expect this to be my first post, but thought I would share it and how I got around it.
The activation link that is sent to your email is incorrect (as is the link in the yellow box at the top).
https://www.youreable.com/forums/yanewuser_register.php?a=act&u=UNIQUE CODE&i=UNIQUE CODE is the one I was sent.
However, it should be the following:
https://www.youreable.com/forums/register.php?a=act&u=UNIQUE CODE&i=UNIQUE CODE
I hope that helps.