Your Commands

Drag the ARMOR from R1 to A4.

Hold ALT and drag the ARMOR from R1 to Axia,
then hold SHIFT and click A4,
then click to select the GREEN button beneath the item panel,
then hold SHIFT and click ARMOR in the item panel.

Your commands should look like:

M: ARMOR @ R1 -> A4
S: ARMOR @ A4 -> GREEN/ARMOR @ AXIA

Note that when targeting an opponent's piece,
you need to specify its color.

Move on to Exercise #17