Well your question is a bit vauge... do you have any examples? I am able to do this without any issue (2015 SP4)
I can select a "start at Point," and this menu pops up. I am not able to "Select Tube" (the popup menu simply compresses). If I hit "ok" the following appears...
It won't allow me to check the flexible hose box. Under "Options" I can see that the Routing Library is looking for a 2103 version on my C: drive by default. I suspect this is the issue? If so, how do I update this routing library?
Using the tubing tab select start at point (your first image)
Next is select tube
My screen will vary since I am using custom tables
choose your tube, select ok you should get a pop up to select your routing template
Check the use flexible option
select ok it should insert your stub
Add point, repeat for second stub
Then route (auto route)
At which step are you running into an issue?