set url value with deluge

set url value with deluge

I have a form with this fields:

Number
Link (url)

I'd like to set the value of Link to include my Number.

Here's an example:

Number / On user input :
Link="http://www.sample.com/" + Number + ".html"

It's not working.

Is there another way to do that ?

How can we edit the other properties like "Link name", "Title" and "Opens in" in Deluge ?

Thanks.

Pascal