When replacing a damaged asphalt roof shingle you can either replace the entire piece or cut the shingle into sections and replace just a single tab.
Replace broken roof shingles.
Use the claw of a hammer to loosen the adhesive under the tabs 2 rows above the damaged shingles and then loosen any exposed nails with the claw.
It goes into detail with specific instructions for removing.
Take the new replacement shingle which must be the same size as the old one and slide it into position.
We had to replace them and all the roofing companies said to do it ourselves because its easy winds of 100km the yard was a mess garbage shingles toy pools.
Now that all the sealant bonds have been broken and all the nails have been removed the target shingle should be loose and can be removed.
When asphalt shingles are loose or missing you can easily replace and refasten them.
In order to replace damaged roof shingles you need to remove the damaged shingle install the new one and seal the edges.
We had a wind storm recently blow off one shingle and damage 3 shingles on our garage.
Asphalt roof shingles can be easily damaged by high winds and falling tree limbs.
And as long as you re on the roof inspect the others close up as well as the flashing to find out whether any shingles are damaged or likely to cause problems in the future.
This video explains how to repair and replace both three tab shingles and architectural shingles.