How to link FollowJointTrajectory action to move-group and gazebo?

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What do you mean by "is not connected to gazebo"? As a side-note, you have averaged more than 3 questions per week since you joined, the majority of them very short and without an accepted answer. Please follow up on your old questions if you solved them.

I meant that they are not connected in the node graph. What is your purpose by pointing out that i have asked three questions per week? I have just started with ROS and have some basic queries which i have and can't find their solutions online.

As is evident they don't have accepted answers as they haven't been answered. Regarding the short questions, i think i have provided information i think is required, if something else is necessary it would be better that people tell me what it is instead of you just stating the point.

There's two parts to this: 1) You should update your questions and make them detailed and good, because otherwise they are not helpful to anyone but you. It's part of the implicit contract of a help site.

2) The people who answer questions have little time. It is in your interest to write a complete, well-formatted, clear question that is easy to follow. Showing that you have put in effort makes it tens of times more likely that someone will want to help you out.

Right now, the quality of your questions is not very high. You should consider that one of the reasons you are not getting many responses is that you may give off this impression.

I would kindly suggest that you dispel that impression it by making your questions more detailed. If you do that well, you will get better responses, learn more, and also help everyone else who has this problem at the same time. Wouldn't that be a good thing? That's all I can do to help right now.