How can I change the collations in my MySQL 5.6 DB to utf8mb4_unicode_ci?

Hi, I have in my DB (MySQL 5.6 in a shared hosting server) several collations and I want to set all of them to utf8mb4_unicode_ci collation and also change the connection charset to utf8mb4 How can I do it using phpMyAdmin for my DB without going table by table? Thanks! Ram