To connect your COBI to komoot, simply download the latest version of the COBI app and activate "Komoot" under connected services. Then you can connect COBI to your existing Komoot account.
I don't see my planned tours
To use your komoot tours on your COBI, you need to activate the region the tour starts in at komoot. Otherwise you cannot use it on your COBI for navigation. The same of course applies to the komoot app by itself.
You will always get a region for free when you register with komoot. How you can activate your free region is explained here.