By default every user that can use Worklog PRO, but they may have restricted access to some features. But administrators may restrict visibility of the add-on to some group of users. Please check Permissions section of the add-on settings. Related permission is "Limit Groups That Can Use WorkLogPRO" permission. If this value is empty (default), every user can use WorklogPRO (but this does not mean they can enter worklog or do other operations restricted with other permissions). If you select user groups, only users in selected groups can use WorklogPROview WorklogPRO main menu and access to features.