To import your subscribers go to Database >> People >> Visitor Browser and when the page loads you'll see a button for importing subscribers.
Walkthrough video: https://use.mindstamp.io/video/xmsGJWkO?editing=1
Click that and it'll take you to a dedicated area for importing. Download the sample CSV, and map your existing subscribers (most likely from another provider) with the one we provided.
If you need any help, just send it to us. We'll do it for you to ensure it's perfect.
Then upload the file and import. Usually, this will take a few minutes to complete and then it's done.
Remember, for your customers to see web personalization or be tracked we'll need a way to identify them and consolidate their record. So either they'll need to login again, or opt-in again to some type of form.