I had them install WHMCS onto my web site at. I paid for

I had them install WHMCS onto my web site at.
I paid for configuration and integration.
venthost.com/clients.
I am going crazy they did not make a page called clients.
although you can see the WHMCS a venthost.com/clients.
Can someone help me because I am getting really poor support from WHMCS. Is ther a way I can fix this with a plugin.
Because when I tried to make a page clients and go to venthost/clients I get a mess.
Can some body help me as what should I do.
I have looked on google trying to find out how to install whmcs with word press there really is nothing on it.
I seen how to install it although I don't know how to integrate it into the page do I have to make the page first then install whmcs to that path.
Regards Vinny