Thanks for getting back, bacmac15.
In my understanding, your employees can be your QuickBooks users, or vice versa. Thus, some of your employees are also under the Users list.
If you're seeing more than 3 users under the Users list, there's a possibility that they are added as Time tracker users. They can only enter their own time sheets that you use when processing payroll.
Meanwhile, what specific tasks you want your junior associates to do in QuickBooks? Do they do administrative tasks (accessing Chart of Accounts, creating bank deposits, income and expense transactions, and others)?
Any information and screenshots you can provide would be much appreciated. It will help me give a clearer view on this.