How to search info and edit submissions?

I am looking to do two things but can not figure out how to to do. Can you please help me?

1. search for a particular entry without having to go through each submission

2. make changes to existing forms-people made mistakes and emailed me to make corrections, but I cannot change any of their information.

I look forward to hearing from you!

1. search for a particular entry without having to go through each submission

You can open your form's submission page, scroll down to the bottom of the page and search the required info from the Search field as shown in the screenshot below:

2. make changes to existing forms-people made mistakes and emailed me to make corrections, but I cannot change any of their information.

You can edit the submissions of the forms.  Again open the Form submission page as shown above and follow the steps explained in this guide: How-to-Edit-Submissions-Made-on-Your-Forms. 

Hope this clarifies your query.