you are using a shortcode for this? Can you post the shortcode?
Normally it works so: Go to the page / post you want to show a slider at the top. Below the editor you’ll find an extra field with different settings. Click “Slideshows”, then choose the type of your slideshow (e.g. “Cycle”) and then the slidehshow source (You can create a slideshow source / pictureset in Allslider).
Save your post and all is done. If it dont work, you can create a temporary account for your WordPress installation and send the login to email@example.com. Then we take a look at it.