If you have several accounts and you wish to copy a template from one account to the other, do as follows.

Log in and go to Templates (1). Find the template you wish to copy and then click on the small arrow next to the "Duplicate" option of that template (2). A search box appears, type the name of the account you wish to copy the template to into the searchbox. When the name of the account appears in the dropdown, click on the name of the account (3).

After this the template will be copied, that means you will see the template edit view on the destination account. Now click on "Save changes", like you do when you save a regular template. After saving it you will be directed back to the original account, where you started with the copying process.