Hi,
Please re-download HikaMarket 1.2.0, we made a patch during the week end in order to fix issues with some popups.
In the front-end, there is no popup system. You have to enter the email address of the user you want to add and click on the button. If the email is correct, the user will be added in the list, otherwise, nothing will happen.
We will see to improve this interface in the front-end but we wanted something secure enough so vendors couldn't add anybody (or access to the list of your users) like that.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.