My tank is different, but they included a vent that glued to the top of the tank to attach the vent pipe to and from there is is a matter of plumbing the PVC DVW pipe to wherever you want it to go.
Do you have a 1 1/2" or 2" vent outlet on your tank? If not you have to install one.
The first thing to install one would be to determine what the tank is made of so that a compatible vent can be installed on the top.
Once you have the vent (if you do not already have one) then is is a matter of running the vent where you want it to go.
Here is one for ABS (many or most are ABS):