Release or disconnect brake.
Pinch the tyre into the centre of the rim. This pushes the bead of the tyre into the deeper central part of the rim making it easier to remove. Carefully use tyre levers or your hand to remove the tyre from the rim.
Carefully run your finger round the inside of the tyre, checking for sharp objects that have pierced the tyre and punctured the tube. Don’t apply too much force as glass/thorns may cut you. Remove any debris in the tyre to prevent more punctures.