Preorder not working: tried apps but nothing shows up

[maygear]

Hello there.

I am using Kalles theme. I will launch my shop december 1 and will be ready to ship on January 25. 

In that arc of time I would like to set up preorders for my products. Now, I've tried prequik and timesact but they do not seem to work (nothing appears or changes while customizing the theme even after installing them). Prequik technical team told me they do not work with a theme like Kalles. Is there anything else I can do? Any other app? Any way to turn this around? I know that without any app it would be difficult, beacause after an order I have 30 days in order to ship it, right?

Thank you for any answer and any help you will provide