This has to be done by the App manager.
First, make sure Simpplr is getting user profile information from Salesforce. From your user profile image, go to Manage > Application > People > User syncing, then select Salesforce as the syncing source.
Once you've selected the syncing source, you can select which fields to sync from the Profile fields tab. The fields that are set to sync with your source are not editable by users.
Go to Setup > Schedulers. If you do not see a date under the Next run column next to "SchedulerBatchInsertPeopleRecords", click on the drop down arrow and select Schedule.
Simpplr will synchronize the user data from Salesforce to Simpplr's People directory every night.