I have added multiple images to a slider, but when I exit edit mode it shows only one button in the slider navigation.

Make sure to add each image as a separate image block.

You can also add any type of block to ceate a new slide. Each block added to a slider will become a slide for the slider.

Also, go into your Edit > Page Properties dialogue box and click on the Custom Attributes tab. Scroll down the the Page Rotator Attributes to select different options for the rotator (including Auto Rotate, Rotate Speed, etc...). After selecting the attributes you want to use they will show up on the right side of the dialogue box near the top. This is where you will be able to actually set the attributes once they are added.