Please for anyone who knows how to change the shield mark of your Kingdom pls help me how to do it
Please post this in the appropriate section of the forum - either general discussion and questions, or maybe technical help - and not on the announcements and rules section… moved it to the first of those now.
Anyway, to answer your question: The crest/symbol displayed on the shield of your kingdom is the same for all members of your alliance, as it is not your symbol but the symbol of your alliance.
To change your alliance crest/symbol, you need to be either leader or general. If so, open your alliance tower, open the edit alliance information menu and there you have options for changing the crest.