Put it on before the penis touches the vulva.
Tear the package along the edge (don’t use your teeth and be careful with long or sharp fingernails).
Wait with putting it on till the penis is stiff.
Unroll it about an inch (not further), so you know hich direction it goes. Squeeze the tip in between your index finger and thumb. This part should remain empty so that the sperm has a place to go. Trapped air will increase the risk of breakage.
Place the condom on the glans and roll it down with your free hand, ill you cannot pull it down any further.
To prevent the condom from tearing the vagina should be wet when you start intercourse. So wait till the girl is excited or use some water-based lubricant (oil-based lube weakens the latex and may cause breakage).