Problem with Bruteforcing with Hydra

Hi I was hoping I could also have some help with my THC Hydra code. So far my code is :

hydra -l user -P /root/Documents/pass1.txt 217.179.43.64 http-post-form "/frog.cleeveschool.net:username=^USER^&password=^PASS^&Login:Incorrect username and password combination"

The problem is that Hydra accepts all the passwords in the password file which means I think I got some of the parameters wrong . Could anyone help me by giving me what the code should look like for this website. Sorry I'm new at this.

Website: frog.cleeveschool.net

Many Thanks