HOW INSTALL WHMCS WordPress Integration ?

HELLO

i want Integrate WORDPRESS with WHMCS !

my main website :

http://fnxsabt.com

my whmcs address :

http://user.fnxshipping.com

this 2 site are locate in different server and domain !

now i can locate main page inside whmcs with this adress

http://fnxsabt.com/?page_id=276

but for another page show page not fond !

like this :

http://fnxsabt.com/https://user.fnxshipping.com/clientarea.php/?

how i can fix this ?