I realized it
Make sure you have all of these. Attention, the print file must be fully vectorized (no pixels, and if there are there should not be many and the imported pixelated images should also be given to us). The mock-up is only compulsory if you create a shop, and advised for your grouped orders.
IF you have all of these, you can fill this form, then continue.
You must be logged in to your partner account to send your design made by yourself. Note that only partners can order their personalized clothing from ONE X WEAR. If you are not yet a partner, you can become it by going to the page "To become partner" in the menu "Start here".