Add a button set or page title to your skuid page and bind it to the object that you’ve built custom buttons on.  Then when you add a button,  look in the “button type” property and you’ll find “Custom SF Button/Link”.  

Unfortunately we do not support inline Javascript buttons.  You’ll have to recreate that functionality in a skuid snippet.

I have already created the custom button in SF but on selecting the button type as “Custom SF Button/Link” I am not able to get the button name which i have created on SF. Actually, it is coming as default populated.