Login is at the bottom of main forum page https://www.ardusimple.com/qa-forum/
If you have issues with the ReCaptcha close the page or tab, and reopen a fresh one.
Hi clive1, I think it’s another annoying wordpress bot, they are very intense the last month. And sorry Community, that we need to add more re-captcha’s and antibot systems to keep the forum clean. thanks for your understanding.