For the URL you enter the appropriate URL. This is the URL you use to get to amberSearch with the addition "search?q=%s".
The format looks like this: https:// XXX .ambersearch .de /search?q=%s. In your case the URL could be composed differently. Important: Don't use additions like "www." If you don't find the right URL, please contact your contact person. He/she will be happy to help you.