Notice empty roll of toilette paper.

Remove empty roll of TP by depressing spring loaded spindle

Slide spindle and roll out of mounts.

Deposit empty cardboard toilette paper roll in waste bucket.

Slide new toilette paper roll in spring loaded spindle.

Replace spindle with new roll of toilette paper on mounts.

Detach glued ends so next person doesn't end up with a frayed mess of toilette paper.