For each survey there is a unique URL (link). For quick access go to: Login » Surveys » Edit
You will find the survey link next to the Preview button.
Yes. You can post this link on multiple websites/pages as you wish. But please note the responses collected will be anonymous.
If you do not want to track who's responded and who has not you may email this Live Survey Link to all the respondents externally.
If you want to track (and send reminders etc.) use the Email/List Management feature.
Yes. You can click on the edit icon and edit the URL.
This feature is available with the following licenses :