How to pass a value to a Modal form and manage the output of form select options on said form, angularJS Style!

I have a simple single page application with some data output on it.  If a user clicks on the USERNAME, the changeABuyer function initiates a modal form which transitions in.  The modal form contains a form select with all available USERNAMES.

What I would like to learn is two fold:
A: Pass the USERNAME that the user clicks to the 'changeAUserModal' modal form, and OMIT USERNAME from Select Options of the changeAUserModal Modal Form
B: Pass the USERNAME that the user clicks to the 'changeAUserModal' modal form, , and tag USERNAME as 'SELECTED' in the Select Options of the changeAUserModal Modal Form



USERNAME Data Output within SPA Index:

ow="fsID" ng-repeat="f in currentRulesF" ng-model="fedTable" ng-if="f.USERNAME != 'FAILURE'">
    <td ng-click="changeABuyer($index)" class="pointer">{{f.USERNAME}}</td>
    <td ng-click="changeARange($index)" class="pointer">{{f.LOW_DOLLAR}} - {{f.HIGH_DOLLAR}}</td>
    <td>
        <button class="btn btn-primary" id="removeRule" type="button" ng-click="removeRule($index)">
            <span class="glyphicon glyphicon-minus" aria-hidden="true"></span> Rule
        </button>
    </td>
</tr>

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changeABuyer Function within controller.js

ope.changeABuyer = function(index) {
    $scope.changeIndex = index;
    $scope.BuyerDD = "";
    $('#changeAUserModal').modal('show');
}

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changeAUserModal Modal Form within SPA Index:

<div class="modal fade" role="dialog" id="changeAUserModal">
    <div class="modal-dialog modal-sm">
        <div class="modal-content">
            <div class="modal-header">
                <button class="close" data-dismiss="modal" aira-hidden="true">×</button>
                <h3>Change A Buyer</h3>
            </div>
            <div class="modal-body">
                <select ng-model="BuyerChangeDD" id="BuyerChangeDD" ng-options="aBuyer.NAME for aBuyer in buyerList"></select>
            </div>
            <div class="modal-footer">
                <a class="btn btn-primary" ng-click="BuyerChanged(BuyerChangeDD)" type="submit">Change</a>
                <a href="#" class="btn" data-dismiss="modal">Cancel</a>
            </div>
        </div>
    </div>
    <button ng-show="changesMade" type="button" class="btn btn-default" ng-click="saveRules()">Save Changes</button>
</div>

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