BT broadband talk and freepbx

Hello there people , I have been reading this forum and it looks the right place to post for help.

I have seen other posts relating to BTbroadband talk and freepbx. I can see config files e.t.c.
basically what I have done is installed it on a virtual machine , but this is where my knowledge goes downhill fast.
Its all running as far as I can see ( i can accsess the webpages e.t.c e.t.c) I have installed all the modules e.t.c , but I really need a idiot guide to seting this up with BT using the trixbox admin webpages. I have tried to edit the configs and add the ones posted here but nothing happend. I have set up the extensions e,t,c its just the trunks inbound and outbound i need help with. Please shed some light on it if you can and thanks very very much in advance.

Regards
David