To active your Crelate SMS subscription, you may navigate to Settings>>Manage Licenses. For more on utilizing the integration, navigate here: Using Crelate's Ring Central SMS Integration
Next, choose the amount of licenses you need and select 'Yes.'
Next, you'll be redirected to the 'Text Message' portal to add and assign your licenses.
After selecting the (+) sign, use the drop down to select which user you would like to assign SMS privileges to.