To schedule, an Apex class from the user interface follow
1. Navigate to Setup, search for Apex in the Quick Find box, then select Apex Classes.
2. Click Schedule Apex.
3. Enter the job name, Example – Daily Account Update.
4. Click the lookup button to search Apex class and select the class.
5. Select Weekly or Monthly for the frequency and set options as needed.
6. Select the start and end dates, and also the preferred start time.
7. Click Save.