To assign a person to a board or a pulse, simply add the person column. Then select a team member, or select the option to invite them into the board by their email if they haven't yet been invited by clicking "invite members."
Add the person column found by clicking the + sign on the right hand side of the board.
We recommend adding a person column to the board as the "head person" in charge of the project and is someone who overlooks the responsibilities of this particular project. In many cases, there are people assisting in moving the project from start to completion which is why you can also add more team members to the project by clicking the + sign beside "add subscribers".