Custom URL for form

-And is the current link going to stay the same like this as long as i am not changing it myself? 
I am planning a silver upgrade in the next days -> the link still will stay the same no matter what?

https://form.jotformeu.com/70693618251358

You can create custom URL of the form by following the instructions provided at https://www.jotform.com/help/261-How-to-Create-a-Custom-URL-of-a-Form

Hope this helps.