How to change capital?

[Blood4u]

I am currently playing as Granada and i need to change my capital in order to sell the province granada to castille,and i can't seem to fiind the button..

Is it only possible with a certain ideea or you can do it in general?
Thx in advance.

 

[Willem IV]

You can't move your capital to a other continent.

The button to move your capital is in left top of the province view.
Just select your desired capital and click the button.

 

[Blood4u]

This means i have to be recked in a war by castille again :/ i do hope they wont charge me on releasing vassals at least.

Thx for all the info.