From Assets / Permits & Licenses.
Select the permit name you want to assign by right clicking on it and choosing "Assign Permit / License"
You can then choose whether you would like to assign the permit / license to either an employee or equipment.
If it is for equipment you will choose the Unit ID from the drop down list or for an employee you would select the employee from the drop down list.
Enter in any relevant identifying information and enter in the expiration date and the date you would like to be reminded to renew.
Once you have finished click "Save"