To remove a catheter, you need to drain the water from the balloon that holds it in the bladder. You can do this by using a syringe and attaching it to the balloon port or the inflation port on the catheter's side. You should draw out the fluid until no more fluid can be drawn. Then, you can gently pull out the catheter from the penis. You should also remove the tube and the bag if there are any. You may want to stand or sit in your shower or bathtub to remove the catheter. If the catheter doesn't come out with gentle pulling, stop and call your healthcare provider right away.

Here are some steps that you can follow to remove a catheter:
- Drain the water from the balloon that holds it in the bladder.
- Attach a syringe to the balloon port or inflation port on the catheter's side.
- Draw out fluid until no more fluid can be drawn.
- Gently pull out the catheter from the penis.
- Remove tube and bag if there are any.