I want it so that when past users open the website, or log in, a label on the homepage will greet them.
For Example,
“Welcome Back, Debbie.”
Is this possible, if so, how do I do it?
If you are doing it after a site member has logged in, then you just need to add a text element to your page and link it to the field in the dataset where you store members names.
Obviously you would need another text box above it with Welcome Back or whatever you choose in it.
Once the site member is logged in then this linked text box will only show the current users name.
If you want to do it when they open the website, then you will need to look into using Wix Storage API.
https://www.wix.com/corvid/reference/wix-storage.html
However, this would open up a big can of problems with regards to user safety and not being secure and confidential, especially if this is done on a computer in a public space.