The photo shows a handwritten note that says "BIKTIGIMDAN DOLAYI YONETICILIĞI BIRAKIYORUM. SAYGILARIMLA. H.İbrahim.SÜS." The joke is that the person is resigning from a position, perhaps a management role, because they are tired of it. They have written "SÜS" (meaning "decoration") instead of "SÜS" (meaning "decoration") which is a humorous way of saying that they are leaving the position. The note is a funny way to show that the person is tired of their job and is looking for a change.