Navigation arrow on Revolution Slider does not appear

I have installed the JUX One template. I have an issue with the Unite Revolution Slider, namely that the navigation arrows on the left and right side do not appear but instead some sort of default empty image is displayed.

Hello Attila Fekete,
Thanks for choosing our product.
About your problem, you can send me your site and your account via PM. I'll check it help you.
Many thanks.

Hello!

Thank you for getting back to me. Can you please tell me how can I contact you via PM? I could not find any contact details of yours.

Cheers,
Attila

Hi Attila Feketa,
Ok. You can send me your information to my email: This email address is being protected from spambots. You need JavaScript enabled to view it..
Thanks.