Thc Hydra Problem/Misunderstanding

So I just found out about thc hydra and burp suite and I wanted to try it myself.

I tried using it to brute force my own instagram password, with a wordlist that has 3 passwords(mine too)

.

I followed this tutorial on doing that.

However when I run this command ;

hydra -l myusername -P passlist.txt instagram.com http-post-form "/accounts/login:username:^USER^password:^PASS^&Login=Login:Login Failed"_

is says :

_Hydra (thc.org/thc-hydra) starting at 2018-07-01 19:09:02

ERROR Wrong syntax, requires three arguments separated by a colon which may not be null: /accounts/login

_

Could someone please help me, I don't understand what is means, could somebody craft the command for me?

Here is the burp suite response: