How can i create a jotform from an existing form?

i have an existing fillable form. But i cannot browsed it in, in order to impot into jotform

I'm assuming what you're trying to do is copy an existing form.

If the form you're hoping to copy was made through JotForm, then yes, you can clone it. All you need is the URL of the form you're about to clone. Here's a quick guide on How-to-clone-an-existing-form-from-a-URL 

However, if that existing form you mentioned isn't created with JotForm, then there's no way to import that into your account. You'd have to manually recreate the form using our Form Builder.

In case we misunderstood your question, we'd appreciate it if you could give us more info so we can better assist you.