To select whether the instrument outputs current or voltage, press either the SOURCE I or SOURCE V buttons on the front panel. Over the bus, send the 'SOUR:FUNC VOLT' command to output voltage or the 'SOUR:FUNC CURR' to output current.

Press the green EDIT button once to select the source level and twice for compliance values. Use the UP, DOWN, LEFT, and RIGHT arrow buttons to change the displayed value. Press the ENTER button when you reach the desired level.