The goal of correlation is to link users in OneSync to users who already exist in the target application for any subsequent actions taken in OneSync and to avoid any user duplication on export. The process of correlation involves creating sets of increasingly specific conditions to match OneSync Users to users already present in the target application.
To start, you create and run a ruleset. Access rule creation by clicking the "View & Add Rulesets" button in the top right of the page. In this view, you will be guided in the creation of conditions and the review of matches based on those conditions. Create rules to reduce the amount of manual matching you will have to do. Try creating rulesets that will, first, accurately match as many users as possible. Subsequent rulesets can consist of more specific conditions to match users not yet matched by broader conditions.
You can also manually match users. Select Users, one from each table, and review their properties by expanding each of their rows. If selected users are a match, press the "Match Selected" button at the bottom left of the view.
Correlation is complete when there are no more OneSync users (left table) to match to users in the target Application (right table) or when no more accurate matches can be made. Any remaining OneSync users will be created in the target Application. Press "Finish Correlation" in the bottom right of the view to save your matches and complete correlation.