Templates need to be defined by the lab manager in the ELN Settings. If templates have been created for a given Experimental Step, you can choose from the list of available templates by clicking the Template button on the Object form, as shown below.
A template of an Experimental Step is an Experimental Step with pre-filled values. Templates are useful when you need to repeat an Experimental Step with the same parameters several times and you wold like to have default values for those parameters.