For cut , you need prepare a image , ideal is black and white (but you can experimenting with colors) and open all closed shapes with a white line (see below on the site how edit a image for cut). Keep in mind that hot wire make a single cut , not have acces to close shapes. Cnc begin cut from a point and return at that point .The cnc making a continuous cut from begin to end.
Open the image with "Scegli file" button (dipends of your language how is named this button, here is in italian language).
When you download a image , in backround running more programs that make your job automatically, from image to gcode, in this mode you not need use intermediar programs ( like inskape,autocad,ecc).
If you want modify size of image, you need modify "scale" .But first need to make a refresh the page, modify "scale" and after download the image again
Now you can save gcode . Make attention where save this file because will need in the next step !
Your cnc , similar to all cnc from the world, have a program who can interpret the standard gcode create by you first.Exist many gcodesender programs , but i reccomand gcodesender from google crome HERE .After install gcodesender , open gcode file (you can open gcode file even if not have costycnc machine buy yet).
Now you are ready to begin cut , only need push button "send to machine " and if you already have buyed costycnc machine ... machine begin cutting!