Start on the item record for the resource you want to assign.
Click the Change assignee button.
Click Yes to continue
Click the target button on the relevant row to select the new assignee - the selected contact will appear in the current selection list.
Click Confirm button to make the change.
The new assignee's name will now show in the assignee field.
All changes of assignee are logged as events and can be accessed on the events tab on the resource's record. The event record details who made the change along with the date and time of the change and the new assignee.
The resources tab on the contact record shows all resources currently assigned to the person. Full resource history reports can be created using the reports button on this tab list.