Titus 1:5
Left I thee .. Titus in Crete or organize. The Greek word means to leave behind temporarily, cf. Titus 3:12
Crete had a large Jewish colony. Titus 3:2, Acts 2:11, Acts 27:7-8
Ordain .. appoint. In Acts 6 the aposltes "appointed" the 7 men but the men were selected by the church. Here the installation is by the preacher, Titus.
Elders .. note the plural.
In every city .. Christianity must have been widespread in the island.