Confusion regarding problem structure

Tell us what’s happening:

I have done this but don’t understand what else have to do after that…please help me out of this.thaks in advance.
Your code so far

// Setup
var myDog = {
"name": "Happy Coder",
"legs": 4,
"tails": 1,
"friends": ["freeCodeCamp Campers"],
"bark": "woof"

// Only change code below this line
delete myDog.tails;

Your browser information:

User Agent is: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.88 Safari/537.36.

Challenge: Delete Properties from a JavaScript Object

Link to the challenge:

It’s a bug.

Your code is alright.

Kindly skip this.

thank you so much bro.