Hi Vik,
I hope you are well, I received your page. To open doors simply move close to the door you want to open and double click it.
You can also set a hot key to open doors that are in front of you.
Many of the basic controls are covered in the tutorial that comes up when you login to the world.
Please let me know if you have additional questions or comments.
We will be happy to assist you how we can.
Thank You
Chris The Avatar