first, click the little red arrow on the left next to where your rings are displayed. it will expand your item slots.
second, make sure you have a powerup in one of those slots. [summons also go there]
third, click on it.
[it should be noted that powerups can only be used when they will actually do something. ie, actually missing health/stam for superchargers, not already having an amp on, being dead, or, having recently been dead, have rings locked...since using a revive will unlock rings]
v
first, click the little red arrow on the left next to where your rings are displayed. it will expand your item slots.
second, make sure you have a powerup in one of those slots. [summons also go there]
third, click on it.
[it should be noted that powerups can only be used when they will actually do something. ie, actually missing health/stam for superchargers, not already having an amp on, being dead, or, having recently been dead, have rings locked...since using a revive will unlock rings]
v