Hi,

I tried creating a new customer in Artio backend and choose an existing account from joomla, see attachment.

It gives me this pop-up, telling me to select an existing user.. but I already did and am not able to create new customers.

How to do it?

Hello, you should click on user which you want to assign with new customer account. Popup is closed after click and you can enter all required data and save the customer. I have tried it at your web and for me it works. Please refresh the page with CTRL+F5. We did changes in Javascript during your customisations and browser can still use old Javascript from his cache. Please send the image by the e-mail if you have a problem to upload it here.