Many good responses heretofore.
Just this--
It is inimical to Presbyterianism, and any sound ecclesiastical government, not to recognize the two-fold responsibility of office-bearers to approve candidates and the congregation to have a say in those who minister, govern, and serve among them. It is a biblical pattern: no one can come into office without being approved by those who already hold office and no one may be imposed on the congregation, i.e., the congregation must agree on who her office-bearers are.
In practice, this means that a man, say, to become an elder must be approved by the existing body of elders and presented to the congregation (perhaps after a process in which the congregation is given opportunity to nominate) for their approval and then subsequently ordained by the approving body (presbytery in the case of a minister). This means that no one may come into office, though the congregation wants him, if the sitting elders do not approve of him. Similarly, this means that no man may come into office, even if the sitting elders approve him, in the case in which the congregation does not approve him. To put someone in office over the objections of the congregation is hierarchicalism and tyranny, plainly and simply. The congregation must approve its office-bearers (as even must, separately, the sitting elders themselves).
Peace,
Alan