Errr... ok... wtf...
Which version of Valkyrie Injector do you have.. Because the updated ones don't need a .dll with them to work..
FaithDEV Injector, Valkyrie 2.0, Valkyrie 2.0 (updated) don't need .dlls - I think. Not 100% sure.
Oh.. I think I know what you mean... You have to put the .dll for the hacks into the inject list..
Download the hacks, open them with WinRar or Zip depending whether it's a .rar or .zip file (look at the end of the name), extract the hacks to your desktop.
Open Valkyrie Injector and set process to Engine.exe, like you did before and press the + button below a big white box that looks like a notepad. It will pop up a search window. Go to Desktop and add the .dll's for your hack. Check if they have a certain order or not. Press inject, start up Combat Arms and it should work, if they're not patched.
You'll get the hang of this stuff l8ter.
Please correct me anyone if I said something wrong. I'm not 100% sure but that's what I did and it worked
Press Thanks if I helped