submenu don´t display in responsive mode

Sorry for my english, i´m spanish...

I have a problem with the main menu in responsive mode. I can´t see the submenus because the + icon don´t appears. Is there any way to activate it?

this is my website: www.iesemilioprados.com

[attachment:1]C:\fakepath\prueba.jpg[/attachment]

Hello,

It's problem from your icon image, it's blank:

www.iesemilioprados.com/media/jui/img/glyphicons-halflings.png

It should be like this:

demo.omegatheme.com/joomla25/ot_rendcore...hicons-halflings.png

So please download our icon image from link above and upload override your current image

Regards

Thanks for responding so quickly. I had taken that picture because I went out this error that appears in the picture I attached you. Might you help me to not go aside those icons when editing an article? Thank you so much hope your answer

Could you please send me your admin account ? so i can check this error.

Email: services(at)omegatheme(dot)com

Regards

i send a emial thank you very much

Hello,

You should edit line 89 file /media/k2/assets/css/k2.css
change this code:
to
Regards