I've tried to "Import Slider" but nothing happens.
I have followed instruction from this video -

When I press the button "Import Slider", there is nothing happen.
Moreover, do I need to activate it ? In the section of Plugin Activation, it says Not Activated.
Thanks a lot for your help and support.
Comments
there is no need to activate slider. Slider can be activated only if you bought it directly from plugin's author and got purchase code. Otherwise, you won't be able to do this. Anyway, please let us know what is your Slider Revolution version? Did you also tried to remove all other extra plugins to check if one of them is not the culprit?