curl -X PUT \
-H "X-Parse-Application-Id: <span class="application_id">yourApplicationId</span>" \
-H "X-Parse-Master-Key: <span class="master_key">yourXParseMasterKey</span>" \
-H "Content-Type: application/json" \
-d '{
     "users": {
		"__op": "AddRelation",
        "objects": [{
				"__type": "Pointer",
				"className": "_User",
				"objectId": "yourUserId"
			},  {
				"__type": "Pointer",
				"className": "_User",
				"objectId": "yourUserId"
			}]
	}
}' \
https://api.parse.com/1/roles/roleId