Solved

Engine-Link/how to sell engine

Another question regarding the engines. Where can I find the link to share it with an „customer“? How can I sell my engines?

I‘m playing on smartphone just in case it makes a difference to the browser game

Customer can click your manager profile, should have an engine icon on the left, customer clicks on it, then tab “supply” and click on green bar with the cost on it

Thank you, I will check that :)

I also build my own engines. now someone I don't want has grabbed / taken the engine. can i kick him or to use it behind my engine?

No only the customer can cancel.  Unfortunately you don’t get to choose unless you coordinate it properly.  As soon as you offer engines for sale anyone can take it up If they view your profile.

You can increase the price though, maybe that scares the customer away?