It's actually either passive or middle. It's meaning must be derived from the scope of scripture.
The verb tasso means, “to place in a certain order,…to arrange, to assign a place, to appoint...to consecrate (R. V. set) oneself to minister unto one, 1 Cor. 16:15…Middle [voice] (as often in Greek writings) properly, to appoint on one’s own responsibility or authority,” (Thayer’s Greek-English Lexicon).
Outline of Biblical Usage [?]
- to put in order, to station
- to place in a certain order, to arrange, to assign a place, to appoint
- to assign (appoint) a thing to one
- to appoint, ordain, order
- to appoint on one's own responsibility or authority
- to appoint mutually, i.e. agree upon