flamethrower can use gas canisters or it can use big gas tanks attached to the flamer's back canisters are safer but dont last as long in the image it is part of the tube the canisters ressemble co2 canisters for paintball guns
When you hit "Submit to a group" a window opens were you can choose one or more groups to submit to. There you have to click the group you want to submit to. If you've done that, a green "Submit" button appears under the list of groups. Right over the "Submit" button a drop down menu appears. Click this, and choose the right category there. Then hit "Submit".