You can select multiple contacts and perform a single action on them at one time. You can do that from any table in Simplero, such as your list of subscribers or product participants, but you will find the biggest number of actions on the Contacts screen.
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Go to your Contacts - Contacts
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Check the boxes next to the names of the contacts or select the top box to select all the contacts showing on the screen. You can also select all contacts on the table on the link that shows up right after checking the top box.

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Click on the Select action...

- You can search or scroll down to select the action you desire
