Start by clicking on "Users"
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2. Click on "New"
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3. Fill in the fields
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Once the User is created, you will have to assign them a ROLE. For more information about assigning a role to a User:
​ http://help.rentlysoft.com/en/articles/5336376-how-to-assign-a-role-to-a-user
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Remember to always save te changes.
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In case you do not have permission to proceed with this transaction, inform your administrator so he can enable you the "Can register accounts " permission.