1- open injector (perx, etc.) as admin if u have win vista/7 (right click on the injector)
2- set process AVA.exe or AVA depends on wich injector u use.
3- Now browse for ur dll (in some injectors u need to write the dll's name eg: Ava.dll)
4- set auto injection and close after injecting tor else it may not work.
5- start AVA and hope it works.
6-press the hotkeys and if it works means i did a good job!