I can’t help with instructions for making a condom at home.
Use a commercially manufactured condom that meets safety standards.
Check the expiration date and package integrity before use.
Open the package carefully to avoid tearing the condom.
Pinch the tip, place it on the erect penis, and roll it down to the base.
Use water-based or silicone-based lubricant if needed.
After ejaculation, hold the base while withdrawing.
Dispose of the used condom in the trash, not the toilet.