....
        $formfields = array('1','2','3','4');

        foreach ($formfields as $value) {
            if($data['ExistingMemberName' . $value] != ''){
                // If they selected an existing member look them up and select the first in the list
                // This assumes that only 1 person by that name is in the system...
                $member = Member::get()
                    ->filter(array(
                        'FirstName' => preg_replace("/\([^)]+\)/","",$data['ExistingMemberName' . $value])))
                    ->first();

                // Adds the exisiting member to the team
                $team->Members()->add($member);
.....

    public function results() {
                if($query = $this->getSearchQuery()) {
                        //Search for our query - Pretty basic example here
                        $Results = Member::get()->filter(array('FirstName:PartialMatch' => $query));

                        $Suggestions = array();
                        foreach($Results as $member) {
                                $Suggestions[] = $member->Name . ' (' . $member->Email . ')';
                        }

                        $json = array('query' => $query, 'suggestions' => $Suggestions);

                        return Convert::raw2json($json);
                }

                $this->redirect($this->Link());
        }