Sorry if this is a really stupid question, but how do you change values to make the virus fire after you have started a simulation and the virus has been generated?
Not at all, ask as many stupid questions as you want.
.mkvirus will cause the virus to begin being created. This will take a while, depending on the length of the virus in question. The time left is given by .vtimer. Once vtimer reaches 1, the virus is ready to fire. You then need to fire it using .vshoot.
The DNA as is constantly tries to fire the virus wether it's ready or not if there's a target visible (another bot that's not the same species). If you take out the vshoot line, and start a new gene with a *.vtimer 1 = in the condition and the vshoot line in the body, you'll have more control over when it fires.