Cannot add vmart user?

[jovigor]

Joomla 3.5.1 - VM 3.0.7
I cannot  add VM user in goldelektronik.net - to enter site: user admin, pass XunsaTre2
There is a link on top OTVORITE NALOG
when i fill every field, nothing happens. (i disable SEF).
I look every post about this topic and nothing worked.
Does anybody know what is the problem?
Thanks

[Jörgen]

If You, as You say,have looked at every post, You would seen that with Joomla 3.5.1 You should Use VM 3.0.16. Absolutely not 3.0.7

regards

Jörgen @ Kreativ Fotografi