Click and then click Setup. The Setup Home page appears.
Type Users in the Quick Find search box and then click Users in the search results. The All Users page appears.
Click the user name to which you want to assign the permission set. The User Details page appears.
Click Permission Set Assignment. The Permission Set Assignment section appears displaying the permissions that have been assigned to the user.
Click Edit Assignment. The Permission Set page appears.
Select a permission set from the Available Permission Sets and move it to Enabled Permission Sets list.
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URGENT! Please register the 10-digit business phone number (e.g. 555-555-5555) that your organization uses to send texts to consumers in the U.S. Failure to register may cause heavy penalties and disruption to all your text messaging communications.
and then click Setup. The Setup Home page appears. 
