I need to design my new survey based on the fact that they may have filled out a previous survey and i need to know how to display the previous survey responses here asking them to edit if anything has changed since the last time they filled it out.
I read this article: https://help.surveygizmo.com/help/prepopulate-a-survey-login-password-action
It helped alot to construct the survey but i need help in the final customization to show the previous survey responses
What help do you need?
If you want the respondents to be able to edit their previous answers, you can just not hide the pages that have them.
If you can elaborate on what you are looking to do with regard to the final customization, users in the Community should be able to better advise you.
Also, you may consider exploring the more general login action article:
There is a section on pre-population in this article that should be helpful.