Step 1: Open your template (if not open already)
On the File tab, click Open.
Under This PC, go to the Documents folder and click Custom Office Templates.
Find your template and open it.
Step 2: Show the Developer tab on the ribbon (if it doesn't show)
Right click on any of the ribbon commands. For example, right click on Home and then click Customize the Ribbon.
Open Customize the Ribbon dialog
Select Developer on the Main Tabs box and click OK.
Step 3: Add controls and other building blocks
On the Developer tab, click Design Mode, and then insert the controls that you want to your template.
Where is it?