I just want to know

download the template & a drawing program. be creative.

where do you upload it

Well, you get the template you want by going to store and clicking create then you take the template in paint.net https://www.getpaint.net/download.html and then you make the shirt template transparent and then make a new layer in paint.net bring it to the bottom color your shirt and then done you have made your shirt.

what they said

click on the store tab. in the top left there should be a button called "create item". hover over and then click on what you want to create.

if you want a more detailed tutorial, feel free to contact me on disc

And download your new Shoes,Shirt or pants and then go back to create click the and by thing i mean like Shirts,Shoes,Pants and then you choose a name for your shirt and a description for it (you don't have to have a description) and make it buyable and then enter the price click the file thing and select your template file then click save it will be there and then you wait for the approval.

Is there not any tutorial on yt?