ENTER command is used to enter some value at any specified Container (like Text-box , text-area etc).

Select ENTER command from the action drop down, select desired Screen name and Element and pass the data/value in parameter section as shown below:

After completing this step, step will look as below:

The value to be entered in the field can be static/hardcoded or dynamic.
Below are some examples:

Example of a static value:

Example of a dynamic value retrieved from global variable:

Example of dynamic value retrieved through a DB query ${__sql(select_PwdFromSecureDB)}: