1. Find the top of the can: first of all, you need to determine where the top of the can is. This can usually be done by looking at the top of the can, there will be a depression that can be seen some distance away from the rim, there is the top of the can.

2. Inserting the bottle opener: Aim the top of the bottle opener at the top of the can, inserting the blade of the opener where the can meets the rim. Then place it up, making sure the opener is parallel to the top of the can.

3. Rotate the opener: rotate the opener to cut the blade through the can. Usually rotated clockwise, some can openers may also require counterclockwise rotation.

4. Confirm opening: Once the blade has fully cut through the can, you should hear a "pop" sound to indicate that the can has been successfully opened.

5. Remove opener: Remove the opener and tilt the can to empty the contents.

6. Safety: Be careful not to injure yourself. When using a bottle opener, you should be careful to keep the rim and blade completely separate, and you should also be careful not to apply too much force to the sharp blade when opening the bottle.