Congratulations on launching your website. Here's how to change your information in your Wix Content Manager
1. Log into your WIX account dashboard
2. Click on content manager on the sidebar
3. Select the category
4. Hover over the project/team member you want to edit
5. Click open
6. Edit the information
7. Click save
If you want to do a quicker edit, you can edit directly in the content manager without clicking open. It words just like an excel spreadsheet and autosaves.
There's also a short tutorial on this in WixLearn: https://www.wix.com/learn/tutorials/site-essentials/content-manager-how-to-manage-your-content-in-a-collection