Lucky Spacer

Ok so how do you create a 4 engine stage? Or what do I do to make it connect on all 4 decouplers?

Ok I have just spent 2 and a half hours trying to strengthen two stages so they don't flop on the launch pad. The top stage has four LV-n Motors attached to a TVRL400 Quad adapter. I then use 4 tr-18a decouplers attached to another TVRL400 quad adapters Which is then connected to the bottom stage. When I send this to the launch pad it flops. I guess the quad adapters are not strong? So I think no Problem I will go add three trusses to each side of the weak point and drag the strut connector between them. Can not get them to connect. Is there some magic point on the modular girdle segment I am supposed to attach to? I have tried all four sides of the end square and the thin x like cables. I have tried symmetry three and 4. So I go: forget the strut connector I will just use the big girdle segments. Can't get them to connect back to the rocket. I have attached a picture. I know there has to be something simple that I am missing but my frustration level is off the chart right now. Any ideas about why I am having such a hard time besides that I am just dumb would be appreciated.

Very Useful Thanks a bunch. Saves me a ton of time.

Well Left Click on the hatch does the job. Not sure how I missed that. Thanks. I did end up installing "Ship Manifest". It also works

Ok Hours in lots. Got my Kerbals in the orbiting Station with a lab. Got my Mun Permanent Station ready to go. Just need to move the Scientist from the Lab to my Mun Lab. I see a nice list of everyone but the Kerbals in the Science Lab. I start screaming thinking that I left them on the ground. GO back to the pilot center and it tells me I did not forget them they are in the science lab. Sooooo... How do I move them to the other lab?? PS am I missing something? Why do I have to eva to move my Kerbals even when they are on the same vehicle? Thanks for the help.