Here are some tips for introducing a Siamese cat to its new surroundings:

1. Give the cat a quiet place to call its own. This can be a small room or a large crate.
2. Gradually allow the cat to explore the rest of the house. Supervise the cat while it is exploring to make sure it is safe and to allow it to get used to you and your other pets.
3. Provide plenty of litter boxes, water and food dishes, and toys for the cat to play with.
4. Be patient with the cat. It may take some time for the cat to adjust to its new environment and become comfortable with you and your other pets.
5. Consider getting a scratching post or pad to help the cat establish its territory and give it a place to exercise and stretch.
6. Spend time with the cat every day, playing with it and interacting with it. This will help the cat feel more at home and bond with you.
7. If the cat is not yet spayed or neutered, consider having the procedure done as soon as possible. This can help reduce aggressive behavior and marking behavior.

I hope these tips are helpful! If you have any other questions, please don’t hesitate to ask.