Help please

[Diamend]

im trying to make it so if a certain named item was in your offhand it would give you levitiation until you removed it this is what i have so far and im not quite sure how to fix it (im new to skript)

on swap hand items:
if off hand item is shulker_shell "&r&dLevitation Charm":
apply levitation 1 for 3 seconds

 

[TobyMinceraft]

a shulker shell named "your name here"

 

[sluhtie]

Make sure to define a player in the condition and effect:

on swap hand items:
    player's offhand tool = shulker_shell "&r&dLevitation Charm"
    apply levitation 1 to player for 3 seconds

 

[TobyMinceraft]

still needs named

 

[sluhtie]

still needs named

Oh yea I forgot to add that my bad