closing segments

[sole1]

hello to everyone, I'm at first with inventor and I can't get out of a problem that will most seem very trivial.
I try to extrude a profile but does not run the command because there are segments detached from the profile itself...how to join them? (talk of 'edit sketch' or 'edit loop' but I can't find anything about it. .

Could someone patiently help me?
Thank you so much! :

 

[stefanobruno]

Could someone patiently help me?
Thank you so much! :

dx button in the browser on the instance of the incriminated sketch --> diagnostic sketch --> follow the requests it proposes.

 

[davide75]

Since you're at first hand, I recommend you the guide of the inventor pruners you find in any library.....