Getting your contacts into a .csv file will depend on where your contacts are stored.
Here are some helpful links that give step by step instructions on how to export your contacts to a .csv file
Exporting Contacts from Redtail
Exporting Contacts from Outlook (multiple versions)
Exporting Contacts from Gmail (Scroll down and click on “Export contacts”)
Exporting Contacts from Salesforce
Once you have your contacts downloaded, you can open them in Excel and copy and paste them over to AdvisorStream.