The owners are responsible for managing the board, defining who will be the owners and members, creating meetings, announcements, and administering the “Knowledge Base” related to the board they are part of.
To add new owners to the board, just follow the process below:
Go to the “Boards” option in the left side menu;
Select the board where you want to insert the new owners;
Click on “+” that appears next to the “Owners” field;
Select the user(s) who will be the owner;
Click on “Confirm”
If you also want to know how to add new “Members” to a board, access the following article: How to add or remove members from a board?