1. Click on "Run" button to execute specific rule.

2. System will run rule and create email reminders from contacts based on conditions of current rule.

How all this work?

When you click the run button, the system starts processing contacts from the last time checked contact ID.
In case you need to start processing from the beginning of contacts, you can click the Reset button (at right side near specific rule), or edit this rule and set "Rule run starting with contact id" to certain value.
The system process of 1000 contacts per iteration, which you can see on the log screen on the Rules page.

Each rule can have several statuses:
Not Started - when the rule starts from the beginning of contacts.
In Process - the rule was executed early, but all existing contacts have not yet been processed.
Finished - the rule was processed all exist contacts.